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A performance artist whose sex is biologically female but who performs in the exaggerated style and dress of a male drag queen. Also known as a faux queen. To be honest, that bio queen's performance was so good that I couldn't tell her apart from the drag queens.
One's biological father, as opposed to one's adoptive father (or perhaps other non-biological father figure). I finally found my bio dad by using some genealogy sites and Facebook.
One's biological mother, as opposed to one's adoptive mother (or perhaps other non-biological mother figure). I finally found my bio mom by using some genealogy sites and Facebook.
euphemism A break to urinate or defecate; a bathroom break. I need a bio break, so I'll be right back.
n. a toilet break. (Contrived and euphemistic.) She out of pocket for a bio break.