Sack Flapping

The sound your ballsack makes when pounding a tight slizz from behind; a good sack flap goes to a beat and makes a soft thumping noise... & can lead to minor bruising and irritation of the stomach region of the partner whos tight slizz or smelly balloon knot is being ravaged

Kelly: "Whats that on your stomach?"
Sara: "I had a good Sack flapping last night"
Kelly: "Oh i got sack flapped last wednesday; and his beanbag bruised the hell out of my tummy "

by Capel & Droughton November 20, 2011

a raging sack of cunt flaps

Someone who is even more heinous than a cunt, because “cunts are still useful”.

What a raging sack
Of cunt flaps!!!

Or, Ed is a raging sack of cunt flaps.

by Smartmouth78 August 13, 2023

Flap Sack

Loose skin on your balls do to tiny nuts

Man mark temple has some flap sack showing through his shorts ..!

by Flap Sack April 23, 2021