Definitions by Rafael Lewis

beater's bump

A bump of muscle usually close to the elbow that is said to indicate if someone frequently masturbates.

Did you see Dave's beater's bump. . .that guy must whack off a lot!

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A lump of muscle on the arm, near the elbow that is said to indicate if someone frequently masturbates.

Some people joked that Carl whacked off a lot because he had a giant beater's bump on his arm.

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