Top Definition
Grandmaster Jay is an Old School Hip Hop pioneer. He first appeared in the late 70s as a rapper and was seen with the like of the stars of that day (Sugar Hill, Sequence, Treacherous Three, West Street Mob,ect) He changed into a deejay in the early 80s and was very popular until RUN DMC appeared and Jam Master Jay stole his name. Many confuse the two to this day. He is a part of The CORE DJs, Funkmaster Flexx's Pitbull All-Stars, Grandmaster Jay is still around today spinning behind major rappers and producing major cuts. He was recently spotted on tour with Talib Kweli and The Legends of Hip Hop Tour.
by HipHopHistorian June 08, 2010

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