The small patch of skin between your little soldier and you butt. Also known as the A.B.C (ass-balls connection), the gooch can be used in many contexts. Usually referring to the patch of skin, gooch can be also known as a derogatory towards anyone. Gooch can also be known as the taint commonly used in movies and or t.v shows.
Yeah, I kicked him in the gooch after I found out he stole my damn cookie.
In "Life", Donald is referred to as the biggest gooch around.