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When one inadvertently purchases an app or in-app item from one's "smart" phone while it remains in his or her pocket.
Sebastian had to email Groupon to cancel his order of a 10-Speed Waterproof Vibrator after he accidently butt bought it.

Liz made a butt buy of 22222 Boosters in Candy Crush Saga.
by phehr May 27, 2014
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