Your a cool kid Share definition Flag A phrase, intended to be an insult, which fails to use the correct contraction of the words "you" and "are", instead using the possessive form of "you". KybrdGyu: Your a cool kid.Grammar Nazi: What's an 'a cool kid?' I don't think I have one of those. Your a cool kid by GrammarJammer April 10, 2011 Get the Your a cool kid mug.