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1.
When someone other than the African race has a overly long penis. Originates for the stereo type of niggers having big penises which is a common mis-conception. They have tiny shrimp dicks that they can't find in there pube jungle.
Girl 1: My boyfriend Chad has a nigger cock.
Girl 2: Your so lucky, my boyfriend only has a spick dick.
by Brian Lynch February 10, 2008
 
2.
An extremely large penis, usually used when the speaker is convinced that all black men have large penises. Does not have to be used in association with negro persons.
"Guess what Sharlot? Jim has a niggercock!"
"How is that possible... Isn't he white?"
by Andrew Bolton March 21, 2005