Nigger Dick is used in
replacement for "Fuck", or "Shit". Its more creative and will get a laugh due to its
randomness.
Because when you think of Nigger Dick, you picture a big, black hairy Penis.
By the way, don't say it in front of a
African American person...unless they know the just, they are from the Bahamas or you REALLY wanna get your ass kicked by some guy named Tyron.