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 Name for some one who owns hard, or who is very popular. That guy is very popular, He must be YaTwice! See YaTwice..

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Sin Muscle Edit Meaning