n. a sharp tapping sound made with a man's testicles. usually against their partner's ass during intercourse. This is also valid against one's chin.
v. sackslapping

When you eat dirt for the first time and leave your family to build a shack in the woods

When a male person rubs their hand across their nut sack and slaps someone in the face with it.

1) The act of rubbbing the sweat off of your own testicals and proceeding to smack the nearest individual in the face

2) when one man randomly decides to smack a mans ballsack in the middle of Lunch

When a girl is giving you head and your nut sack slaps her chin, nose or cheek (depending on position), usually after a most-aggressive head bobbing.