It is just basically a short term of the word what do you mean.
There's also many other words that we can also use it shortly. These words we can also use them when messaging each other instead of just tying the whole sentence which is very long and not cool looking.

More words:
ROFL means Rolling on floor laughing.
STFU means Shut the *freak* up.
LMK means Let me know.
ILY means I love you.
YOLO means You only live once.
SMH means Shaking my head.
LMFAO means Laughing my freaking *a* off.
NVM means Never mind.
Thot: I want u daddy
me: wdym??
by III Tempered May 17, 2020
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WDYM (question) is an acronym standing for "What do you mean?" usually used in slang texting.
You: "I really want to die"
Your friend: "wdym"
by Gerold xd August 3, 2018
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Abbrevation of what do you mean.
"Can you get one of my glasses?"
"Wdym the blue one?"
by Don't read my pseudonym April 23, 2016
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Tom: Yeah isn't that awesome?
Nic: Wait, wdym?
Tom: You should have been listening!
by Wesss January 7, 2007
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Normally used when texting between friends.

Ex:

Friend A: My instagram page is getting hacked.
Friend B: WDYM!!!!!!????????
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W "What" WDYM
D" Do"
Y "You"
M "Mean"

W "What" WYM
Y "You"
M "Mean"
Wym/Wdym I can't do that?
by OOFYuna July 1, 2023
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