Zmm 

The act killing yourself in front of a Costco parking lot.

Mike: did you here that Ella Zmm last night!

Zmm by MymainmenDoug April 16, 2020

ZMM 

Abbreviation for the book Zen and the Art of Motorcycle Maintence.

....a book that other books write about

If you think logic is independent of myth, you are not going to like ZMM.

ZMM by CoolHandLuke55 January 27, 2022