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 both scrotum are inserted inside the anus along with the penis. ie: 'bringing the bags in'. This can be done either with ..
1.
Bingo slang for '18'.
"Voting age - number 18!"..