A word popularised by the character Marty from the 2005 hit film, Madagascar. The word is used when something is very good. It can also be used as an introductory greeting.
"hi Sammy, what's Crackalackin?" "nothing much Robert how about you?"
"how was the party last night" "Crackalackin!!"
Its something a handsome gentleman would say as his catchphrase
"Hey guys whats crackalackin?" says Angus, "Not much, whats crackalackin with you?"