Thurglump Share definition Flag A large body of water, eg. heavy rain or wave which has the capacity to engulf a person or object, on a Thursday. " That Thurglump nearly sunk my canoe" or " I took me hours to get ashore after that Thurglump" Thurglump by Caffof June 22, 2006 0 0 Get merch Get the Thurglump mug. Buy Now — $32.95 See more merch