(obsolete) A person who deserves to be, or is likely to be, hanged; a gallows bird.

(informal) A sudden, unexpected and unintentional change in the pitch of one's voice when speaking or singing, which often affects boys during puberty.

The signal for the final dissolution of all things by God; the last trump; the end of the world.

simple past tense and past participle of crack up

An outdoor children's game in which participants try to maintain hold of hands as random movements by the leader at the head of the line increase the force at the tail, as with the end of a whip.

(figuratively) To make harsh demands in a position of leadership.

(informal, simile) Utterly crazy or insane.

(slang) nitrous oxide used as a recreational drug

present participle of crack up

(intransitive, drugs, slang) To show signs or symptoms of excessive crack cocaine use. / (transitive, drugs, slang) To intoxicate through the administration of crack cocaine.