Derped Share definition Flag Being derped is being karate chopped by Derpy Hooves. Since she is a derp and a screw up, she may karate chop you to make you screw up. Person 1: Dude, why'd you drop your phone? Person 2: I got derped. Derped by Heriotza March 22, 2013 0 0 Get merch Get the Derped mug. Buy Now — $32.95 See more merch