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1.
The constantly changing area where a man or woman, usually a woman, has her arm in a swinging motion. This swinging motion is usually a sign of her awareness of a local male and her intention to punch him in the balls if he approaches.
"Jeff, if you get into my swinging space your balls are gonna die!"

"Catherine, I'm not in your swinging space!"
by Squackary April 11, 2010