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An initialism of "I am not a/an," used in online communications to clarify that one is not a professional in some field or topic they are discussing or giving advice about. Look, IANA engineer, but I think that voltage will be too much for the capacitor you're using. That's what I've seen according to the stats I've read about, so take it as you will. IANA scientist or anything.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.