As it is explained by Johnny Depp, who plays Donnie Brasco in the movie "Donnie Brasco"
"Forget about it" is like, if you agree with someone, you know, like "Raquel Welch is one great piece of ass, forget about it." But then, if you disagree, like "A Lincoln is better than a Cadillac? Forget about it!" you know? But then, it's also like if something's the greatest thing in the world, like minga those peppers, "forget about it." But it's also like saying "Go to hell!" too. Like, you know, like "Hey Paulie, you got a one inch pecker!" and Paulie says "Forget about it!" And then, sometimes it just means forget about it.
by Donnie Brasco March 9, 2005
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a response used to another person's statment meaning 'unbelievable' or 'unreal' or 'extraoridnary'
Tony Montana took 23 gunshots to the body before the mob took him down.
Listener's response: Forget about it
by Frank Bazan August 17, 2004
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Mafia slang.
1) Sometimes means just what it says ie it would be beast for all concnered not to rememeber.

2) That someone or something has no chance of succeeding
1)That thing you just heard me an Alfonse talking about - forget about it.

2) The yankees to be the red sox - forget about it! They got no hope.

by Anonymous May 12, 2003
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"forget about it", means:

(A) You have just been forgiven a major trespass by the Don.

(B) The Don wants you to think you are forgiven, but really, you are about to die.
"Fuckhead about it" = Gangsta version of "forget about it".

"Oh, faggot about it, thilly!" = The gay pimp (Peter Seller) version of "forget about it".
by Peter Seller July 5, 2006
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New York term for:"No comment" or "I would rather not say".
Usually sounds like "Forgedaboudit" and spoken slightly loud to put an end to the subject.
Vinnie: So Guido, how much money did you make at the race track yesterday?
Guido: Forget about it!
by thedzone October 16, 2009
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The lyrics to a song that's on The Breakfast Club or something. If you're searching this you are extremely bored and you have nothing better to do.
Don't you forget about me! Don't, don't, don't! Don't you forget about meeee!
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