When a male or something with nuts submerges their testicles into a cup of warm water while their partner blows profusely through a straw that has been inserted into the cup creating a jacuzzi affect. For added pleasure the penis is usually wildly jerked with the blowers free hand until ejaculation.
The gentle bubbles of the ballcuzzi tickled my sack as I unloaded my penis gravy
When one takes a bowl (ceramic/glass/plastic) fills it with warm water, preferably around 95°. Lower your testicles into the bowl. Then use a straw (preferably a silly straw) and have someone blow at a steady pace forming small bubbles that massage your scrotum/testicles. Just like a jacuzzi, hence the BALLCUZI
Yo bitch, why dont you grab a silly straw and give me a ballcuzzi, Fuck.