tac-vom Share definition Flag A tactical vomit, used to relieve oneself of crippling illness. Most common during or in the aftermath of heavy drinking. See Tac-Yac I felt like shit, but I snuck in a cheeky little tac-vom, and now I feel great. tac-vom by nmb1908 May 8, 2014 0 0 Get merch Get the tac-vom mug. Buy Now — $32.95 See more merch