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1.
the menses of an infertile woman
"It seems so unfair that Jill still has to endure her visits from Aunt Flo," Donald remarked sympathetically. "Doctors have assured her that she can never bear children, yet every month she is still obliged to have her date with the Red Barren."
by Andrew Roedell April 26, 2007
 
2.
Blindfold yourgirlfriend with a scarf. Start banging her doggie style. Pull it out quickly and sneak it up her butt like the redbarren.
Mike gave Ethan the redbarren.
by kevin case May 03, 2006