What is Underground Boombox?
1.
the act of beatboxing into a woman's vagina during cunnilingus in order to give her pleasure some rhythm.
I gave her an underground boombox when i went down on her so that even if I wasn't that good, she could at least enjoy a catchy beat.
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1.
When you move beyond the have a cow stage, and you actually find some chick (or guy) who will suck you off. You spray some aerosol whip..