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acronym for "back up hook up", default booty call when other options have been exhausted. A guaranteed hook up with a non significant other - wining and dining is not required.
"When returning home from college on winter break, Brian calls his BUHU, and knows it's a sure thing."

"It's 3 AM and the only guy Elzea knows she can get in touch with is her BUHU."
by BriMeh August 12, 2007
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