"I need to wash my hands bad[ly]" [duplicate]

Possible Duplicate:
“I feel bad for you” versus “I feel badly for you”

I'm terrible at the usage of bad vs. badly. Given the sentence:

I need to wash my hands bad[ly].

Should the correct term be bad or badly?

Part of your issue is the placement of badly. Where you have it in your sentence, it is trying to modify "wash"; however, what you want is for it to modify "need." So I would suggest this:

I badly need to wash my hands.

And even better:

I really need to wash my hands.

It would be better to say "I badly need to wash my hands" or "I need to wash my hands, badly". Where the adverb goes and how it's punctuated, if at all, determines what it modifies.

On the other hand, rather than using the ambiguous term badly here, you would be better off saying "I really need to wash my hands". In both cases, badly and really, the meaning is that your hands are very dirty and definitely need to be washed.