nuts and bolts
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nuts and bolts | Slang reference for the male genitalia, meaning the penis and scrotum.
Meaning
<p>Nuts refers more to the testes within the scrotum, while the bolt portion of this slang term, refers to the Penis itself. </p> <p> This is due to its shape resembling a bolt, long and circular, with a top like a bolt has.</p> <p>Nuts because they are located at the end of the bolt, which the balls are.</p>