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The process of when one male thrusts his penis in an up and down motion through another mans scrotum as the balls are wrapped around the penis.
Tom: Hey m8 wanna come round tonight?
Clarke: I dunno m8 will you make it worth my while?
Tom: Yeah m8 I'll give you dat dere ballfap.
BallFap by whatdafukbro May 1, 2010

BallSlap 

From the term, "to get your ballslap on". The sound thats created by the balls in heavy and vigorous sex with a female from behind doggie.
(Mike) Why are you walking like John Wayne?

(Sean) coz i got my ballslap on last night wid dis dirty gashment!

"Ring me back in 10, i'm getting my ballslap on"
BallSlap by Stuart Macdonald February 23, 2007
Ballfart just ballfart
You just say “ Ballfart “
Ballfart by SirWafflez July 17, 2019

ballslap 

The act of slapping someone in the balls. Usually done from behind the person and swinging down towards their balls over their shoulder.
There's nothing like a good ballslap to ease up the nerves.
ballslap by RenegadeTeabagger March 9, 2003
when a female passes gas on to a males testicles and scrotum during intense and deep sex, most notable in the missionary position.
"doooood I was slayin this broad sooooooo hard last night that she totally ballfarted me. you know if she don't ballfart, you aint doin it right, kid."

"oh lover when you ballfart me, it is as if a pleasent zephyr passes over my testicular hairs, like a gust through a meadow of sugarcane"
ballfart by ballfart-bro December 29, 2008