Top Definition
Being great at what you do; being the best at only what you are good at.
Guy 1: Hey! Can you help me with this?
Guy 2: Sure!
Guy 1: HOLY MACKEREL!! You're the best at this ever!
Guy 2: Yeah. I'm a Koolvin.
by Anti Christian September 07, 2009
5 Words related to Koolvin

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