mod. very difficult or challenging. (Usually objectionable.) : Man, that was a real ball-busting job. I hope I never have to do that again.
mod. very obnoxious and threatening. (Usually objectionable.) : Who is that ball-busting bitch?
mod. very industrious. (Usually objectionable.) : That's a real ball-busting crew working on that job.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.