Fuhgettaboutit - most commonly used in New York.
Used when someone is angry or showing signs of denial.
Hey man, you think you could give me a lift?
HA! Fuhgettaboutit pal.
Fuhgettaboutit is a word that most Italian-Americans (usually from New York or Boston) use to say "forget about it" or "don't mention it". I as an Italian-American find myself slipping up and saying instead of "Forget about it, that's all right!" I say "Fuhgettaboutit, that's all right"! This can be used by people other than Italian-Americans, but it originated from our roots.
Itsme: I forgot my homework!
ChicagoChick: That was brilliant.
Itsme: Can I get the answers?
PayUpps: Thank you so much!
Can I go out with you?