1 definition by Whitening toothpaste
When the seat of the pants are either too stretched out or there's not enough booty to fill the pants, the extra fabric is booty slack.
Jennifer: Hey, Cheryl, check out John today!
Cheryl: Well, he looks damn good, but he's got too much booty slack.
Cheryl: Well, he looks damn good, but he's got too much booty slack.
by Whitening toothpaste March 01, 2014
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