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Short for 'swinging below 7'. When you or your mate is cracking onto/hooking up with someone who is clearly below a 7 on the attractiveness scale.
"Old mate left ages ago; went home with an SB7."

"He's on poor form tonight. He's been SB7ing all night."

"She SB7ed with that guy from the bar."
by teamcooper November 29, 2012
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