Forget about it" is like if you agree with someone, you know, like "Raquel Welsh is one great piece of ***, 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 saying "Go to hell!" too. Like, you know, like "Hey Paulie, you got a one inch pecker?" and Paulie says "Forget about it!"