Somebody one might consider be "cool" to an extreme. Derived from the words "Sham" (Cool) and "Fool" A common term used by those from gang cultures.
It is often used to demonstrate respect for a fellow comrade out of admiralty.
Jacinda: Yer thats her spouse over there, sorry to say shes taken my fellow citizen.
Jerome: Dayyum that is wown Sham Foo!
Horatio: She's way out of your league chum.
Jerome: I'm the kayng of sham gangsta!