To neck/ make out with some one so rough and hardcore that you bend or brake the other person's nose.
"Becky needs a nose job now because dave lamped that shit in!"
"Did you see them two? They were practically lamping their noses in!"
Lamp her nose in: "man it was crazy last night, I lamped her nose in."
Chicken-o is a chicken orgy for those chickens who like to ruffle their feathers.
Omg! Thereâs a chicken-o going on over there!