Cockshlap Share definition Flag Cockshlap: A derogatory reference to call someone who you preferably don't like. Johnson: Hey Harry. Harry: Yeah Johnson? Johnson: You're a Cockshlap Harry: fuck you Cockshlap. Cockshlap by Aggrolas November 23, 2015 0 0 Get merch Get the Cockshlap mug. Buy Now — $32.95 See more merch