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To get an erection from non-sexual/strange/unusual stimulii.
Playing scrabble always gave John a huge weirdon.

erection weird hardon scrabble
by drhooss February 08, 2015
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A hard-on/wide-on brought on by something/someone not conventionally considered sexy that you weren't aware you found sexy until its occurrence.
I got a weird-on from watching that YouTube video in which Rick Ross takes off his clothes and rubs his man tits. I was pretty creeped out with myself.
by Ayo Sexology November 17, 2008
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n. what occurs when something weird is happening and you just can't keep it contained.
"Dude! You just gave me the biggest weirdon!"
by rye won't you? July 05, 2005
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