Playful slang for a soft, limp, or flaccid penis. The opposite of happy penis.
My girlfriend unzipped my pants, but my penis just hung down. She looked up at me. "Sad penis?" she asked with a pout.

"Sad penis," I sighed.

She grinned wickedly. "I'll fix that," she said, as she took me into her mouth and started to blow me.
by Comet of Shadow June 30, 2013
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When after masturbating, you feel inmense sadness and/or dissapointment in yourself
Man, i had an awful sad penis experience after masturbating over those old pics of my ex
by Mr. Morsa December 5, 2017
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