A tremendously long bowl movement which, upon evacuating the rectum, falls forward, slapping the back of the scrotum before falling into the toilet.
by thezfunk March 10, 2010
An Atomic Nutslapper is when you are getting head and your girl starts to punch your testicles like a boxer using a speed bag.
Person 1:Yo I heard you got head from Misty and she gave you an Atomic nutslapper
Person 2:Yeah my fucking testicles hurt bad
Person 2:Yeah my fucking testicles hurt bad
by fuckcalebs November 24, 2019
by The_commie_doggo February 26, 2019