negrumps Share definition Flag a fellow criminal or partner in crime. What it is, what it is, NEGRUMPS! What you need to do is start gettin back into some crimes, man. Now smoke this weed, negrumps! negrumps by PaleBlueEyes5 October 10, 2014 0 0 Get merch Get the negrumps mug. Buy Now — $32.95 See more merch