An expression you say when you see or here something you don't want to or didn't expect to hear.
OMG NAT! did u hear that tom and jerry aren't friends anymore?
WHAT THE BUTTCHEEKS are you serious Jay ?,that's crazy they have been friend's since 3rd grade!!
so basically when you say “what the buttcheek” your basically saying “what the fuck” just in a more funny matter. I know it sounds kinda childish, but it will most definitely get you out of trouble.
Chris: Bro I just won a million dollars!
Esequiel: What the buttcheek! congratulations man!