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Abbreviation of Whatever yo Momma Works in McDonald's. Usually comes with a mime done by the hands where the W is formed with your thumbs touching each other, pointing up plus both index fingers are also pointing up while other fingers are hidden away. This forms the W and is inversed (i.e. the aforementioned fingers point down) when doing them M.

a W-M-W-M is shown in quick succession in time with "Whatever yo Momma Works in McDonald's".
In an interaction with two people (typically a cussing match) Person 1 says something Yea yea yea, dude you suck. Person 2 then replies with "Whatever yo Momma Works in McDonald's" while at the same time showing the WMWM.
WMWM by Andy B with the Bass March 11, 2009
Related Words
We Miss White Men Group-chat is a Group-chat created by Twitter users Quinn (@DreamsIronDoor) and Tyler (@Imisskarl). This GC was originally called the “Better Dream SMP” and then was referred to as the “Purple Piss SMP.” It now goes by the name wmwmASS gc, or the Seraphic SMP. Ray, the president as of November/December, is the president and Molly is the VP. Sapph was elected mayor but Soha burned down their house. The active member are Ray, Molly, Soha, Sapph, Big Q, Lil Q, Tyler, Jo, Sofia, and Yoko.
“have you heard of wmwm gc?”

“yeah! they’re a pretty popular gc on mcyttwt.”
wmwm gc by imisswilbur December 15, 2020

wmwmwmwm 

When your are severely bored that you decide to write "wmwmwmwm", because they are the longest letters on the qwerty keyboard.
William: "What is the longest letter on the keyboard?" Jason: "I think W and M." William: "Ok!" WMWMWMWM
wmwmwmwm by Elliot Hoskins December 8, 2023
When you are so bored that you are stressed out. Typing this is just to tell someone that you are dying in bordism. W and M are the longest letters on the keboard.
someone can be extremely board, and ask, "What are the longest letters?" and the answer is W or M and then they type WMWMWM.
wmwmwm by Elliot Hoskins December 11, 2023