sex act performed on unsuspecting women by enterprising males in which after a particulary thorough deep throat session, the male proceeds to defocate on the females teeth and then brushes them with his dick. Then proceed to sing "let me see them grills your what? Your grills.."
Honey, after we're done tonight, would you mind if i admninistered a Mc Grill unto you?
Mc Grill is the act of a man crapping into his partners teeth after which the man takes his dick to brush the shit all over his partners teeth. Let me see them grills!
"Man I want some grills but I cant afford it". "Dont worry man ill help you out!" " Mc Grill it!