n. (bad) body odor. (Initialism.) : Man, do you have BO!
n. box office, where tickets to some event are sold. : If you want your money back, you'll have to go to the BO.
n. HBO, Home Box Office, the cable television channel. (Initialism and dysphemism based on sense 1.) : There is boxing on BO but no movie.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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