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The act of swinging your arms back and forth in a wide arc across your body while walking forward with the intent of striking fear in the hearts and minds of anyone who is foolish enough to get in your way.
1. Guy one: Dude, I thought you were going to fight that jerk today.

Guy two: I was but he pulled out the swinging jenny and I ran.

2. Guy one: Hey what stopped the basketball game?

Guy two: Some idiot did the swinging jenny through the middle of the game.

Guy one: didn't anyone try to stop him?

Guy two: are you kidding, it's the swinging jenny!
by mattyportman December 10, 2010
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