Grumpy Customer Share definition Flag A really big dump, that may or may not be currently slamming against your rectum. Hey guys, I'd love to help you, but I've got one hell of a grumpy customer right now. It requires my full attention. Grumpy Customer by walrusnuts November 18, 2020 0 0 Get merch Get the Grumpy Customer mug. Buy Now — $32.95 See more merch