Zip n' Slip

Unzipping your pants and proceeding to fuck without removing clothing. Similar in meaning to a quickie.

Example 1:
Bro 1: "How was the party?"
Bro 2: "It was awesome man, my girlfriend gave me the look and led me into the bathroom for the ol' zip n' slip!"
Bro 1: "Niiiice!"

Example 2:
Girl 1: "How was the movies?"
Girl 2: "It was spicy, my boy and I got some sex in with the ol' zip n' slip!"
Girl 1: "Niiiice!"