Is 'Some of y'all' grammatically correct?

Why or why isn't "Some of y'all" grammatically correct?

Example: "Some of y'all have too much free time"

Solution 1:

Basically "y'all" is just a casual, familiar term for "you", so "some of y'all" is essentially the same as "some of you".

(And, per livresque's comment, it should be noted that "y'all" is normally considered plural. For this reason it's somewhat useful in conversation, as it makes it clearer that the associated context is being addressed to a group, and not just to an individual. This no doubt is a big reason for the term's persistence.)

"Y'all" is normally, in the US, considered a "rural" usage, and it's used in country music (such as Y'all Come and movies/shows (such as the Beverly Hillbillies) that portray rural characters. However, since it's considered "illiterate" it's passing out of fashion.

Solution 2:

In Britain we never use y'all (unless we are imitating a Southern American accent).

However, in Britain, it is perfectly idiomatic to say, for instance:

Are you all going to the party? (this makes it clear that we are speaking to everyone present and not to just one person)