Used as an expression when someone does something so randomly stupid its funny. its sort of like, the action is the word after the "u know ur cool when" so "u know when ur cool when (you've peed in a can)"
by the coolest guy November 8, 2006
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You Know You're Cool When • you know you're right • Before You Know You're Dead • you know how i know you're gay? • I know you're asleep but • i know you're not laughing • You know what you're saying? • if you're happy and you know it clap your hands • hey-you're-a-fool-and-you-know-it • you're so sussy i know you took my fortnite card