Question: who said forget about it?
Answer: 'Fuhgeddaboudit' seems to have become a pop cultural meme around the time of the 1997 film Donnie Brasco. Here's a quote from Johnny Depp's character on the phrase's meaning in mafia culture: 'Forget about it' is like if you agree with someone, you know, like Raquel Welch is one great piece of ass, 'forget about it.