the ball sac in the crotchal region.
The little brother to the big brother in the crotchal region
The crotchal sac may be hairy or shaved, but if not shaved it would be considered crotchal swamp sac
"Mark, if you have inflammation of the crotchal sac then your probably are going to need anti-biotics"
"Dave: don't suck on my crotchal sac, Ive got anti-biotics for it"