Fuhgeddaboudit

Definition:
Forget about it.

Usage:
"Hey, tryin' ta get downtown durin' rush hour? - Fuhgeddaboudit!"

Explanation:
When used by New Yorkers, "Fuhgeddaboudit" can mean several things.
It might mean "the thing you are speaking of is not worthwhile, will not work, has been declared illegal," etc.
It can also be the speaker's way of signalling that he/she no longer wishes to contribute to the topic at hand.
And it can also mean that whatever the current topic of discussion may be, regardless of who has stated it (even the speaker) is thereby declared null and void and without merit.
Additionally, "Fuhgeddaboudit" can be used as a substitute for "you're welcome." See also no worries.

Trivia:
New Yorkers, who do everything in a New York minute, talk fast. "Fuhgeddaboudit" was once at least three words. In New York, it is one word. There also may be a variety of spellings.

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