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The mysterious black, grody, substance that appears on skin and clothing after a good night at the bars. You could be out for 3 minutes or hours on end, but you'll end up with bar tar no matter what. Hails from Athens, GA.
Darline: "Where did this black stuff come from all over my flip flops and feet?"
Bonnie: "Darline, don't you know, that's BAR TAR."

Stephen: "Why do I have BAR TAR all over my green pants? I was only at the bars for 20 minutes. Someone would think I was waaaaasted if they saw these."
by Ahjiggity jig jig December 12, 2006
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The sticky, dirty residue forming on the floors of bars due to a combination of spilled drinks and the dirt from the bottom of people's shoes
"Fuck, man! My new Jordans got so filthy from all the Bar Tar last night!"
by MegadethFan345 June 13, 2015
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