When a girl handles your testicles with unrelenting vigor, groping your jewels very aggressively. I.e. she rattles your balls like she's working a craps table. Very pleasurable.
Friend: Dude, did you get with that bootylicious dimebag last night?
Receiver: Yeah man, she totally craps tabled the shit out of my testicles while sucking on the tip of my cock! I came so hard I thought my soul exited my body through my penis.