After a long day of hot sweaty work, putting your hand down your pants and filling your palm w/sweat from your scrotum. Then with said sweat slapping somebody dear to you.
Yo man, I just got off work and I went up to Andrew and gave him a Scrotum Slap.
A male dips their scrotum in tea and then furiously jabs their partner in the face with it. Then they stuff it in their partner's mouth cleaning the tea off of its surface. Then the male backs as far as they can go in the room then charges the women with their sack in one hand and facing outwards. When in contact with the women he tackles her and then begins to slap her across the face with his dry scrotum.
When a man inserts his penis into the rectum of another gentleman, the two scrotums (scrota?) come into contact. As the intercourse intensifies, the scrotums will make a distinctive slapping sound. Umm, at least that's what I've heard. I read about it once, honestly.
Buck: So are you and Carldating or what?
Ned: Nah, we just slapped scrotums a few times.