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Someone, usually female, who has indiscriminate sex with patrons of a particular bar and everyone knows about it, hence, everyone and anyone can ride it. Usually motivated by low self-esteem, pathological need for validation and/or inability to maintain composure when drinking.
That Mary chick is the bar bike. She's slept with every guy in here.
by TheDannyLovesSauce June 04, 2017
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