crestin Share definition Flag The action of drinking so many Mountain Crest Classic Lagers that your walking with your teeth! Usually used in context when propositioned for evening/weekend events. Eric: Nagz what the fuck you doing tonight? Joe: Crestin man!! Eric: you are true 1337 buddy! crestin by Nagz May 29, 2007 0 0 Get merch Get the crestin mug. Buy Now β $32.95 See more merch