detpack Share definition Flag In TFC, an explosive device that is set by a demoman and, despite giving off noises that make it blatantly obvious it's there, still kills no fewer than four n00bs each time. Unless you're deaf, there is no excuse for being killed by a detpack. detpack by Evil Zak July 26, 2003 0 0 Get merch Get the detpack mug. Buy Now — $32.95 See more merch