With your ball sack stretched over the mouth and nose of the receiver you then grab the base of your cock and slap them between the eyes and forehead with the tip. Works best when erect or semi pudged.
Zach: Dude did you see that? I BatSlapped LB so hard it left a red mark on her forehead.
When three dudes are banging one chick at the same time and their ball sacks are smacking against her chin, her ass and the vagina/taint all in rhythmic harmony. Smack, smack, smack.
What’s that smacking sound coming from your roommate’s room? Oh he and his two Bros are doing the three bag slap on the chick next door. Sweet!
When three dudes gang bang a chick and plug every hole while simultaneously and rhythmically creating a rapid slapping sound of their balls hitting against her chin, ass and taint.
We gave Becky the ol’ three bag slap last night. It was music braaaahhhh.