nomfg Posted in N Best definition nomfg the word that falls out of your mouth when you attempt to say “no” and “omfg” at the same time, used in form of objection, or shock Kid: They’re selling calculators at staples for a dollar. Nerd:NOMFG!!! How satisfied are you with the definition? Looking for nomfg meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 96 times.