A sexual maneuver in which a guy cums on a girl's boobs, and then mixes it with the girl's own secretions, and rubs the mixture together on the aforementioned boobs.
Note: This can also be done with the buttocks, but is then called the Buttered Sandwich (this is not quite as popular, however)
"Hey Mike, I totally gave Kelly a buttered roll last night"
"Oh cool man! GITSUM!"
*bro high fives*
To masturbate by rubbing the penis between someone's butt cheeks
i'm not up for anal right now, but i'd sure take a buttered roll instead