To masturbate, especially after having not relieved yourself for an extended period of time.
Jake: Man dude, after Em ground on me and then got up I have a serious case of blue balls!
Blake: Looks like you'll need to try beating the worm if you want to feel better any time soon bro.
by GNU/Linux Guy August 9, 2016
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A coded message that is used to let your bros know that you are down to give them a handjob. If they respond positively they are basically giving you consent.
*watching sports with the boys*

Paul: "guys I beat worms"

Eric: "oh neat I've always wanted to try this."
by Givemetheticket July 20, 2019
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