Pierre Garcon took it all the way back to 1989 this week ... busting out a live version of "Just a Friend" with rap legend Biz Markie ... and TMZ Sports has the footage.
The Washington Redskins wide receiver was hosting an event for The Boys & Girls Club of Greater Washington when he got on stage with Biz and belted out his biggest hit ... while a pumped up crowd including many of his Redskins teammates and NBA Superstar John Wall sang along.
The All-White clothing party raised more than $100k for TB&GC ... so, nice work!
BTW -- Garcon was 3 years old when "Just a Friend" came out ... feel old yet?
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