The act of one person poking Cornflakes up the butt of another.
Guy #1- "Hey, Mark, how was your anniversary?"
Guy #2- "It was uneventful for the most part; Beth and I just spent the better part of the night Cornflaking."
Guy#1- "Dude, that's disgusting."
Guy#2- "Don't knock it 'til you've tried it, Jeremy."