I went through the lexicon and it really sounds like they have taken elements of two distinct slangs as the etymological base for their patois.  Specifically hard-boiled slang (Chandler, Hammmet) and Mid seventies British Slang.
There is a nice roll to it, and the few that sound forced can be forgiven.
	
	
	
There is a nice roll to it, and the few that sound forced can be forgiven.

 
 

 
