A term for products whose "secret" features are well-known (but not publicized)

What do you call those household items whose selling features are purportedly practical, functional and ‘innocent’ but instead are often bought for completely different, and sometimes ‘naughty’ reasons?

In time the makers hear of this secondary use and exploit this “extra” feature, or modify the design in order to meet public demand, without confessing the real reason behind it.

I'm thinking in particular of those massage instruments sold for “back pain” such as the one below. Nowadays, we'd simply call it a vibrator, but until the mid-fifties these gizmos were called massagers

Today on supermarket shelves there are certain roll on deodorants (for both sexes) whose size and friendly ergonomic shapes are unequivocally sexual. I suppose there aren't that many taboos left but the fact that one can openly display a deodorant stick in one bathroom's cabinet without embarrassment is very convenient…

On a much more serious note, there are certain cough medicines that are sold over the counter that customers discover have secondary/hidden benefits (initially anyway).

Some over-the-counter (OTC) and prescription cough and cold medicines contain active ingredients that are psychoactive (mind-altering) at higher-than-recommended dosages and are frequently abused for this purpose.

• Dextromethorphan (DXM), a cough suppressant and expectorant found in many OTC cold medicines. It may produce euphoria and dissociative effects or even hallucinations when taken in quantities greater than the recommended therapeutic dose.

• Promethazine-codeine cough syrup, a medication that contains codeine, an opioid that acts as a cough suppressant and can also produce relaxation and euphoria when consumed at a higher-than-prescribed dose.

… cough syrups, pills, and gel capsules containing DXM—particularly “extra strength” forms—are frequently abused by young people (who refer to the practice as “robo-tripping” or “skittling”).

^{National Institute on Drug Abuse}

• What do you call products whose hidden or secondary function is really its selling point? I might call them double entendre products, but do manufacturers have their own jargon?

• What do you call any product whose secondary use (or abuse) is accidentally discovered and then becomes its raison d'être. Any product can fall in this category. In the comments below, Tushar Raj suggested bubble wrap which has become famous for being a stress reliever, and less so for its primary purpose: wrapping fragile objects.

Solution 1:

"Off-label use", per Wikipedia: "is the use of pharmaceutical drugs for an unapproved indication or in an unapproved age group, unapproved dosage, or unapproved form of administration."

I think it would be understood if use of the other items in your posting (massager, cough medicine) were referred to as "off-label" also. I'm not sure there is one hypernym for all of these non-drug types of products, but it wouldn't be a stretch to say that all of these "types" of products have additional "off-label" uses.

Solution 2:

I think unintended use conveys the idea in general. The phrase is used both informally and formally. For example, it is used in International Product Liability as a formal phrase.

There is also a website called Museum of unintended uses and the motto is the art of using things differently.

Here are some clever examples from the same site:

Ipad Stand:

Bagel-to-go:

The smart professor doctor Chairman:

Sports cycles:

Solution 3:

I can't think of a term for the products themselves, but the act you describe might be called repurposing, which Wikipedia defines as follows:

Repurposing is the process by which an object with one use value is transformed or redeployed as an object with an alternative use value.

Solution 4:

For your first question, all such products, even if their "hidden" (unadvertised) collateral uses are beneficial and/or benign, but especially if they’re damaging could be called “misused///misapplied products.” I doubt, however, if manufacturers would use these negative terms to market such products.

On the other hand, although slightly 'oxymoronic' with negative connotations to boot when used to describe certain family members, perhaps using “overly helpful products” (with a wink and a nod) for products whose collateral uses are beneficial could help capture/emphasize (and take advantage of) the notion that they have beneficial uses that were not originally intended, e.g., "You'll find our overly-helpful deodorant/back massager good for what ails ya."

For your second question, having been the product of “serendipitous innovation,” you could perhaps call a product whose accidently discovered “serendipitous use” has become its recognized and advertised raison d’être a “serendipitous product.”

Although "serendipitous product" could also be used for a product with hidden beneficial uses (question 1), I think it would also require a wink and a nod.

To avoid having to literally do the winking and nodding yourself, you could modify ‘product’ with a word (in its sense as a verb) that already contains the winking notion [and which could even be seen as having its own double (mis-) entendre (Arun's review), if not multiple ones] e.g.:

Discover your own/(or ‘Discover a world of’) serendipitous uses for our highly “intimating///intimative product.”

Frankly, in spite of all my attempts above, I find that your suggestion of “double entendre products” captures very well the notion you seek in question 1, as perhaps would synonyms/near-synonyms for it:

“allusive//insinuative//‘innuendal’//polysemous(mic) products” and the like.

Solution 5:

You describe illicit uses for these products.

The synonyms are easy to look up. Illicit's the best fit here.