IAFWU
IAFWU definition by Slang.net
This page explains what the acronym "IAFWU" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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IAFWU means I ain't f***ing with you. It is an acronym used to assure a person that you are serious.
The IAFWU acronym is a vulgar way to say that you aren't joking with a person. It is often used by a frustrated person who is tired of being accused of lying or joking about something.