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1.
a sentual expierience in which a gay man pets the lower ''gooch'' below the genetalia of his intimate gay partner. this is commonly known as a after dinner mint. these were both created by tyler andrew clark a famous gay kama sutra specialist. he also created the stinky charles and sunkin row boat see definitions for full results.
1. "hey samuel whats 2nd base for a gay guy"
"silly you know damn well... a little undernut"

2."want an after dinner mint or should we just shove it in"
by Clearance Drinkwater July 03, 2006
 
2.
Similar to side boob. This refers to the trace of scrotum visible between a nude male's legs when viewed from behind.
"Have you seen "The Room"? It's got some major Tommy Wiseau undernut!"
by movie_dork May 23, 2009
 
3.
The area directly below the scrotum.
I don't know why my undernuts is so itchy.
by Dreadlocke May 13, 2006