Zip slip 

The act of your dick unintentionally falling out of the front flap in your underwear. NOT to be confused with the more ambiguous dick slip

Brad: Ow, fuck! Yo Chad, wait up!
Chad: What’s wrong bro, can’t keep up?
Brad: Nah bro, I had a zip slip!
Chad: Ouch, man! Hope you didn’t chafe against the zipper too bad!
Brad: All good, dude. This one was far from my worst.

Zip slip by SquirrelFkr April 30, 2021

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!"

Zip n' Slip by Frorian August 20, 2018

zip one's lip (or mouth) 

to stop talking (See also shut up)

Zip your lip and get to work.

zip one's lip (or mouth) by Light Joker September 5, 2005