this expression is commonly used in text messages, both cellular and online.

It stands for "What Do U Mean"

although it is mostly used by itself, in order to ask for more information from the other person. Sometimes, one will type "wdum by 'gah'?"
MangaAngel: and i was like, all hyped, but gah! DX

IMissYou: wdum?

MangeAngel: i was all excited about the game, but we lost.
by IMissMAJ February 24, 2009

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