Once fabled as the deepest you could get, balls deep has been surpassed by gooch deep. Gooch deep is where you go in so deep into an orifice, that you are able to shove your balls into said orifice as well, so you are no longer bound by the limiters that are your testicles. Being gooch deep means that your gooch is now touching the rim of the hole that you are pleasuring(or punishing).
The black man went gooch deep into his victim, even though he promised to only go balls deep.
by Tyrone Phillips March 22, 2008