Behaviour which is contrary to social expectations, which is inappropriate or rude.

plural of bad beat

(Britain, Ireland) Bad luck, failure, or evil befalling.

present participle of break bad

(colloquial, of an event or of one's fortunes) To go wrong; to go downhill. / (colloquial, especially Southern US and Midwestern US, of a person) To go bad; to turn toward immorality or crime.

plural of bad trip

(slang, drug use) A psychedelic crisis, the undesirable dysphoric psychological effects during hallucinogenic drug use, most often fear, paranoia, and especially horrifying hallucinations

plural of bad girl

Used other than figuratively or idiomatically: see bad, girl. / (slang) A female criminal. / A woman whose rebellious nature makes her attractive.

(figuratively, used with a possessive) Disfavor.