Sin Muscle

What is Sin Muscle?

the muscle in the forearm which is used to masturbate (jack off)

Laura: Nice sin muscles! Haha!

Anthony: How do you know they're not from doing jazz hands!

See sin, muscle, forearm, masturbate, up, down, movement, jack, off

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1. a guy or a girl that u arnt going out with, and u only use them 2 make out and do nasty stuff. i dnt want a girlfriend but i wanna hook..

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1. 1: One Of the ultimate sighns of bordem at school and so you type it up on Google etcuse they have blocked everything fun, And your actu..

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1. exclaimation of positive excitement, brought back in to circulation by lil' jon and the east side boys. lil' jon yells... &q..

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Sin Muscle Edit Meaning