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A sperm donor, usually some poor bastard who's been sucked in to providing swimmers for a friend.
"He's the sponor"

"What you need, is a sponor not a boyfriend"
by Fiveby5 September 04, 2008
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Jun 21 Word of the Day
A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.
"I'm tough, Mike! I never give an inch! I'm partial to taking a few though..."
"Ah, you're a real pipehitter."
by Skeletalchemy June 15, 2021
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