cracking in WordNet English dictionary

1. very good
   "he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
   bang-up  bully  corking  cracking  dandy  great  groovy  keen  neat  nifty  not bad  peachy  slap-up  swell  smashing 
   

1. the act of cracking something
   fracture  crack  cracking 
   
2. a sudden sharp noise
   "the crack of a whip"; "he heard the cracking of the ice"; "he can hear the snap of a twig"
   crack  cracking  snap 
   
3. the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)
   cracking