Cracking
WordNet
adjective
(1) Very good
"He did a bully job"
"A neat sports car"
"Had a great time at the party"
"You look simply smashing"
noun
(2) The act of cracking something
(3) A sudden sharp noise
"The crack of a whip"
"He heard the cracking of the ice"
"He can hear the snap of a twig"
(4) The process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)