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"
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!"