boojum (also, b00jum) Share definition Flag 1. A ghost, wraith or other evil spirited mysterious terror. 2. Master of things fearsome and evil. Damn b00, that is messed UP!!! boojum (also, b00jum) by anon April 1, 2004 0 0 Get merch Get the boojum (also, b00jum) mug. Buy Now — $32.95 See more merch