1 definition by trxstr

Top Definition
A blowjob a man gets from his female patner when menstruation prevents the couple from having vaginal sex. Uncle BJ is often a man's only available option for sex from his wife or girlfriend when Aunt Flo comes to visit.
Wife: "You'd better forget about tonight, honey. Aunt Flo's coming for a visit."

Husband: "Well, I hope she brought Uncle BJ with her!"
by trxstr January 01, 2010
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