Meaning of cracking

(adj) very good; "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"; "we had a grand old time"

(noun) a sudden sharp noise; "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig"

the act of cracking something

the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)