M-stank Share definition Flag A person who has very bad BO. To qualify, everyone in a 50 mile radius must be able to smell the stench. Yo m-stank, you forgot to put on your deodorant. Now we're all gonna die! M-stank by Hollar April 16, 2004 0 0 Get merch Get the M-stank mug. Buy Now — $32.95 See more merch