When you punch someone in the gut, crumpling him over, then punch that person in the face.
Mike Tyson beat him with the old 1-2.

Note -- Also carries ambiguous sexual connotation.

Bill: I gave her the old 1-2.
Ted: ... dude, fucking wifebeater.
by My Fist February 9, 2006
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sex act where you eat the girls pussy, then fuck her in the ass. Also known as the Lick & Stick.
I'd sure like to do the old 1-2 on Paula every week.
by bread infection January 2, 2006
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"I'd like to give her the old 1-2."

"What's the Old 1-2?"

"Butt to mouth. I'd butt her to mouth any day."
by Catfish96763737 October 6, 2011
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In driving: The act of activating a turn signal, but turning the opposite direction of said turn signal to throw-off pursuers.
Perry: "Use the old 1-2 switcheroo!"
Heidi: "What the fuck is the 1-2 switcheroo?"
by desPERRYado April 15, 2006
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When 2 males stand on each side of a girl on her knees while she uses KY Tingling Sensation Lube to masturbate both of them continuously until they start to ejaculate and then they bend back there boners counter side to her ASS cheeks and slap her on the ass with their dicks.
Nillina was on all fours so Manlord and Blacklighte could give her the old 1-2 ghetto booty slappy.
by Nillina and Manlord lol December 6, 2009
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