What you tell your friend when their cheeks (alternatively, their "Gyatt") looking a little more scrumptious than usual and you just have to have it
Person 1: "Hey Jake! *ass bouncing as he walks" How have you been recently?"
Person 2: *Looking at Person 1's fat ass* "John, I fuck with you heavy. Give me that Gyatt!"
To make out with someone extremely hard, so much so that it's like you're eating each other's faces. You can add a comma before heavy just to add extra emphasis, maybe change your tone for it, too.
Yeah man I was walking to class and there was this hallway couplemacking face heavy.