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1.)When your underwear gets entrapped in the crack of your ass. Also see Wedgie

2.)What a male might say after sexual foreplay just before intercourse when the female asks "How do you want it?"
d1.)Whenever I wear boxer briefs I always tend to get a butt up.

d2.)Female says: "How do you want it?" The male replies, "Butt up!"
by Comkind October 16, 2007
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A type of shorter-all with straps tight enough to raise the posterior accompanied by a deep v-cut on the front and/or back side
Given his low budget, Brian was forced to wear his denim butt-ups & a tie (no shirt otherwise) to his sister's wedding.
by Websterman October 10, 2016
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