Top Definition
An acronym for "I wouldn't but Mufeng would," usually means that you would not do anything that Mufeng would do.
Dude 1: "Hey would you fuck a guy in the ass for a billion dollars?"

Dude 2: "IWBMW"

Dude 1: "Real talk."
by thefuckingzenmasterdyang January 04, 2010
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