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An occurance involing an individual of negro, or miscegenated, heritage vanishing at a time in which something needs to be done or witnessed(by the nigger not present). Often confused with Slack Ass, occurances are usually symptomatic of Nigger Mortis.
Tyrone pulled a Nigger Disappear for the results of Shanika's, LaQueefa's, Yolanda's, Ja'Mika's and De Shawna's paternity tests.
by TMan44 August 23, 2005
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