A smooth, subliminal way of saying "Classy". If said correctly, the person receiving this subliminal insult will think you said "Classy" but in all actuality you are referring to their low social status. That status being, class "C".
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.