A man who realizes he is the third wheel on a date or activity with a romantic interest instead of her friend. As a result the likelihood of any sexual activities drops to zero.
"How was your date with Sandy."
"I thought hanging out with her friend would score me some major bonus points, but I turned into a lesbian chaperon."

This phenomenon can be seen often at Malls and Bars and is often preformed by husbands.
by sbxconlan January 17, 2013
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