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The pinnacle of friendship. When one friend or coworker shares a BART ride together, they become bonded as BARTners for life.
Want to be BARTners?

Melissa is my BARTner.
by LugaMan April 14, 2017
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the term refers to one that serves as a drinking companion, specifically to a bar.

a bartner can be a friend, relative, classmate, coworker, etc.

an ideal bartner would be one who enjoys a similar drinking environment, holds a similar (or superior) alcohol tolerance, has similar taste in the opposite sex, is skilled at acquiring rides, etc.
After their microbiology exam, Pete and Tom bumped into each other at the local bar. From that day on, they were bartners.

Although Lisa and Tina had little to talk about at work, they were the best of bartners once Friday rolled around.
by notmadjustdisappointed May 27, 2010
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A combination of partner and boyfriend. For gay couples who have been together for a long time but do not yet want to use the "P" word.
My bartner is being such a bitch. I should burn his face off with an iron.
by svenskified August 30, 2006
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