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A play on "Murphy's Law," just with genitals. When you shave your downstairs area because you think "tonight's finally the big night," it almost 100% guarantees you will not get laid.
"So , date three--did you and Mary Todd finally do the deed last night?"
"Nah man, I got all psyched and shaved before we went out and jynxed myself."
"Ah man, Murphy's Balls in effect."
by Pejamus May 28, 2018
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