(vulgar) Something or someone that causes discomfort or frustration.

(slang, vulgar) Rough, aggressive; powerful and successful. / (slang, vulgar) Excellent, first-class.

A beating, sometimes prearranged. / A brutal and decisive defeat of an individual or group of people by another who had thoroughly dominated them in doing so, such as in sports.

(colloquial) Oriented backwards, particularly after a mishap. / (idiomatic, colloquial) Hopelessly misguided; contrary to what is normal, expected, or logical; having taken the utterly wrong choice.

(colloquial) Moving backwards, that is, rear end first. / (idiomatic, colloquial) In a hopelessly misguided manner; in a manner contrary to what is normal, expected, or logical.

present participle of kick ass

(vulgar, slang) Tough, uncompromising and inflexible.

(vulgar, slang) A tough and combative person.

(vulgar, slang, derogatory) A rotund, overweight, or obese person. / (derogatory) A jibe used on someone disliked, frequently someone regarded as lazy.

(US, vulgar, slang) Someone who succumbs to authority, doing whatever authority figures ask and attempting to please them in every possible way. / (US, vulgar, slang) Someone who performs anilingus.