On the slack 

Gentleman’s appendage at rest.

“How big is it?”
“On the slack or off?”

On the slack by Slapheadylicious April 7, 2020

Spit on the back, Empty the sack

Doing a girl from behind, once you are about to climax pretend to cum by spitting on her back, pull out, then when she turns jizz in her eye.

Little tip...Aim for the middle, you'll both of her eyes.

Spit on the back, empty the sack

She thought I emptied on her back, she wasnt to know it was spit, see turned, then boom!! I emptied my sack in her eyes, the perfect shot.

Spit on the back, Empty the sack by barb heaps December 10, 2006

On the sack 

niggas who are always in your shit.

"Ay where are you going?"

"You're always on the sack! Get off squirrel humper!"

On the sack by Sk8 Depot November 9, 2007

Sack on the table 

term coined by commercial real estate brokers

to put ones ball sack on the table to convey

back up your bullshit

balls fully on the line

standing behind your word
reputation at stack

when i tell you they can close i put my F*cking sack on the table

Sack on the table by bigsackbilly November 13, 2019

Sack Whack on the Back Crack 

The act of thrusting the man junk so far into a woman's (or man's if you are homosexual) anus multiple times that the balls consistently slap against the "host's" butt cheeks making a sound like a great high five.

KirtKanReed: "i am soo hungover bro, i can't remember anything about last night."

ChadKant: "you wouldn't want to."

Zenovia's Playa: " YEAH! BECAUSE CHAD GAVE YOU THE sack whack on the back crack WHILE YOU WERE SHIT FACED DRUNK LAST NIGHT AND PASSED OUT ON THE COUCH!"

Sack Whack on the Back Crack by Zenovia's Playa June 14, 2009