When you slide a finger into someones butt, especially when they're not looking.
2 Main reasons: Makes a good caramel color on the inside and a brown coating on the outside AND the finger slides like its coated in butter
Todd was bending over to pick up a quarter so i had to slip him the butter finger.
Stands for Bitch Ass Crackas
The Flyest White Boys on the block roll with this clique...BUT THEY CANT
That kid wishes he was down with B.A.C