Derived from the word Cretant which basically refers to a person of low creaturely status. It can also be used as an adjective to mean "exist." Cripper is a shortened word from Cretant and is just used in everyday lingo amongst good friends referring to eachother as Cripper or making fun of somebody and calling them a cripper. Calling somebody a Cretant would be the full master usage of coarse.
Cripper, what are you doing tonight?
YoBob, that guy is a total cripper!
Where do you want to crip tonight?