(slang, Canada, US, vulgar) To work very hard, to put in a lot of effort. / (slang, vulgar) To hurt or beat up.

(Canada, US, slang, vulgar) To find fault with someone, to constantly criticise.

Equus hemionus hemionus, a subspecies of the onager, found in Mongolia and northern China.

US standard spelling of give a rat's arse.

Used other than figuratively or idiomatically: see lick, someone, ass. / (idiomatic, vulgar) To flatter someone (especially a superior) in an obsequious manner, and to support their every opinion.

(idiomatic, slang) To flatter someone (especially a superior) in an obsequious manner, and to support their every opinion to gain their favor.

present participle of give a rat's ass

simple past tense of give a rat's ass

Third-person singular simple present indicative form of give a rat's ass

past participle of give a rat's ass