The act of accidently striking oneself in one's balls, in an unusual way.
Jonny and Tom are talking about playing a board game, when Jonny tells Tom how he Glenned himself.
Jonny: Aw man, I had a book sitting on my lap while I was playing that game. I got so mad I slammed my fist on the book, and it hit me in the balls.
Tom: Aw man, you totally Glenned !
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