Putting your finger inside a girls mouth to test to see if she is going to use teeth, AKA is a cheese grater.
Bro1: Did you get head from that chick last night?
Bro2: No, she failed the alligator test. No way I would put my dick in there.
Bro2: No, she failed the alligator test. No way I would put my dick in there.
by GangBangOrangutan February 11, 2011