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

Up The Dutch

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Putt-fucking

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Thissic

1. a weakness often characterized by a bluing of the skin and a watering of the eyes. Usually occurs in people who feel sorry for themselve..

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Sin Muscle Edit Meaning