NFAA Posted in N Best definition NFAA Acronym for: Not Funny at All. The exact opposite of FTW. “Your post was nfaa.” “I wish you would stop posting, because everything you type is NFAA.” How satisfied are you with the definition? Looking for NFAA meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 69 times.