Mr. Crabblepants Share definition Flag A person(s) who is in a pissy mood and takes their anger out on a person(s). Person - OH HAI! A Mr. Crabblepants - SHUT THE HELL UP YOU PIECE OF SHIT Mr. Crabblepants by SEANSEANSEAN September 9, 2007 0 0 Get merch Get the Mr. Crabblepants mug. Buy Now — $32.95 See more merch