As used in the heavy truckin' industry. "Twin screw" is a reference to a truck with tandem driving axles.
Also, the obvious sexual fantasy of most any man walking this earth.
Check out the chrome on that lime green, twin screw, extended frame, long nose flat top 379!
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When you swab your ass after an extremely satisfying, hard, clean shit, and the paper comes up clean. AKA one wiper.
Credit to DB in MO.
Man, that was an awesome shit! I only needed a security wipe!
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