A slut who gives you hopes of a good fuck, only to cancel on you last minute causing the excess cum produced from anticipated sex to be bottled up. This leads to balls swelling to the size of a grapefruit.
Guy1: "Bro, my balls hurt from hanging heavy. My slut bailed out on me again."
Guy2: "That slut's fucked up."
Guy1: "Nah bro, she's cool. She can just be a real cumstopper sometimes though."
Guy2: "That slut's fucked up."
Guy1: "Nah bro, she's cool. She can just be a real cumstopper sometimes though."
by BelASSis February 02, 2013
This is when your "dick ridding" but then suddenly stopping and switching sides and excetera, it is also a word you would call your friends for fun even though they aren't doing it
"Nah bro is pulling a cumstopper you were just dick riding him but now you finally hopped off"
"No you cumstopper"
"No you cumstopper"
by Sleelyheadera March 18, 2023
your girlfriend is a cumstopper
by ziggy pigg November 26, 2006