For Black American ghetto inhabitants, a sarcastic phrase denoting a conjured spectre or imaginative person who is usually culpable for mysteries, crimes, happenings, occurrences, or any other unexplained event, leaving one in bewilderment.
Inspector Lee: Well, all the clues have been analyzed. And we still do not know who murked Ron-Ron.
Gladys: Must've been That Nigguh LeRoy...
Gladys: Must've been That Nigguh LeRoy...
by Craig an' Nem February 20, 2011