Also found in: Acronyms.
An initialism of "I am not a doctor," used in online communications as a caveat when offering an opinion on or giving advice about some medical issue. It sounds to me like you might have a hernia, but IANAD, so you really ought to go to the hospital. Look, IANAD, but I really don't think such a tiny amount of raw chicken is going to put your life at risk.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.