(chemistry) The thermal decomposition of a substance, especially that of crude petroleum in order to produce petrol / gasoline.
The formation of cracks on a surface.
The production of a crack sound.
present participle and gerund of crack
That cracks; that produces a sharp sound as of something splitting or breaking.
(colloquial) Great.
(colloquial) Enjoyable.
(Britain) Very, usually associated with praise.