Sacktaps 

if Someone makes a deal or a promise, saying sacktaps at the end means if they don’t live up to their word means a slap to the kids

Yeah mate I told you I’m gonna buy it. “Sacktaps” aww ffs bro my left nut still hurts from the last one.

Sacktaps by Laurelgang December 28, 2017

sacktap 

the quick flick of one's fingers making contact with another's ballsack, causing a delayed, but tremendous pain in the lower stomach region of one's body.

Brandon sacktapped Jerry and made him cry.

sacktap by Daniel Tyrrell July 20, 2004

Sacktastic. 

1) Something so incredibly nuts, that it can only be testicles.
2) Something contained in an extremely awesome sack. Ie; nuts, or balls.

Man, that flip was sacktastic!

This team is incredibly sacktastic.

Sacktastic. by Just Like A Disease May 21, 2009

sacktap 

a slight and subtle flick of the wrist to a man's testicles, causing him to fall to the ground in pain, and occasionally cry.

I sacktapped Luke, and now he can't have children.

sacktap by Jo-dizzle December 28, 2005

Mexican Sacktap 

A hypothetical situation in which a large ring of gay men engaging in anal sex perform Newton's balls, creating a chain reaction that, with a little effort, can continue indefinitely around the circle like a Mexican Wave around a sporting field. There are no recorded occurrences of this.

'I started a Mexican Sacktap but it didn't make it around the circle because Bastian wasn't thrusting in time.'

Mexican Sacktap by Authur C. Commons April 20, 2008

sacktapping 

touching one's genitals. can be used in various circumstances, e.g. sacktapper, sackmacker, sackslapper, et cetera. often used to insult one or to denote someone as a good friend.

didn't you, you sackTAPPER?

sacktapping by Ryan September 22, 2003

sacktap 

When somebody sneaks up on a guy and lifts his foot quickly (but not a kick) and taps his balls.

"I snuck up behind jack and tapped him"

sacktap by Zacharias May 13, 2005