The area between your ball sac and your butt hole.

N: The area posterior to the scrotal sac and anterior to the anal sphincter.

when heroin addicts take a hit they start 'gouchin'

The particularly hairy, sweaty, and easily entanglible part of the male anatomy in between the "scrotum" and "anus"

the space between this balls and the asshole is the gooch, not the gouch.

The mild state of unconsciousness experienced whilst under the influence of the drug heroin

Gouch Goo - t ch; A mythical creature that must be respected. Often regarded as "The working-mans Unicorn" or "That piece of skin between your ball-sack and your anus"