Mucho Masturbation

Mucho Masturbation is a line sang by Mark Cohen in RENT. Mucho mean much, many, or a lot, so taking what that word means, we can put that with masturbation and see that mucho masturbation means "a lot of masturbation" or "many masturbation sessions"

"I was so bored last night I did some mucho masturbation after watching RENT"