(slang, vulgar) To fail to function properly. / (slang, vulgar) To be left unresolved.

plural of fat-ass

(transitive, idiomatic) To cause (someone) to seem foolish.

plural of smart ass

The hypothetical donkey, in context of certainly dying of hunger or thirst by being unable to choose between the two equidistant options.

(countable, chiefly derogatory) A person or organization who doesn't make a choice. / (uncountable, chiefly derogatory) Collectively, people who don't make a choice.

Alternative spelling of Buridan's ass (“the hypothetical donkey who is the subject of a philosophical paradox concerning choices of equal value”)

plural of Buridan's ass

(pornography) A sexual act in which the penis or another object is removed from someone's anus and promptly put straight into another's mouth.

plural of ass juice