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

Alternative form of wisecracking

(informal, simile) Utterly crazy or insane.

(slang) nitrous oxide used as a recreational drug

Alternative form of crack-the-whip

(organic chemistry) The cracking of petroleum hydrocarbons, at high temperature in the presence of steam, in order to produce ethylene, propylene and other light alkenes

present participle of steam-crack

plural of crack train

(US, dialect, dated) Fastest express train between two stops.

simple past tense and past participle of steam-crack