The moment at which a man reaches orgasm while simultaneously having his prostate stimulated. The peak of his life. Sometimes poop comes out.
Wow, it looks like Greg must've hit his manscendo last night with Mindy. The cleanup wust have been a real bitch.
by Poogazm November 13, 2019
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"I gotta go check on Mainstone guys."
"Fuck off."
"Did you see Sarah?"
"Yeah, her top was so mainstone!"
"Fuck off."
"Did you see Sarah?"
"Yeah, her top was so mainstone!"
by Smoothbrain420 October 25, 2023
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