Pronounced "ClassSea" but can also be pronounced separately to make the insult known by all people around you: "Class Sea"!
Marcus: *walking into the company Christmas Party wearing a skin tight shirt, unbuttoned five buttons too low*
Susan: Wow, Marcus! You're looking very Class "C" this evening!
Marcus: Yeah, I fuckin' know. I spent 4 hours in the fuckin' gym. You know what Sandra? You're fuckin' hawt!
Susan: Uh... it's Susan... Thanks.
Susan: *spoken softly under her breath while walking away and rolling her eyes* Fuckin' guido.