M-stank Posted in M Best definition M-stank 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! How satisfied are you with the definition? Looking for M-stank meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 66 times.