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
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