When you want to make fun of asshat pseudo-lawyers when discussing someone's medical condition, prefix or postfix everything you say with this acronym.
You might say, in response to someones stomach pain:
An abbreviation for "I am not a doctor, nor a nurse; in fact, I have no medical training whatsoever. In fact, I have only a vague idea of the positioning of the internal organs."
Surgeon: "IANADNANIFIHNMTWIFIHOAVIOTPOTIO"
Patient:"...What?"
Surgeon: "I am not a doctor, nor a nurse; in fact, I have no medical training whatsoever. In fact, I have only a vague idea of the positioning of the internal organs."