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1 definition by Christopher Henry

 
1.
Literary colloquialism for "probably", most likely first used in print in John Kennedy Toole's Confederacy of Dunces, (1980), in the speech of one of the book's characters, the mother of the protagonist, Ignatius J. Reilly. The use of the word is meant to reflect the speech typical of white working-class residents of New Orleans, Louisiana.
That prolly is the reason he left in the first place.
by Christopher Henry September 21, 2005