A erection one would get in pre-historic times, such as cave (rock) men
"I poked my head into your window and betty was undressing. She saw me there, but she didnt stop."(Barney)
"What?"(Fred)
"She didnt stop. I mean, she saw me there looking at her, but she kept undressing."(Barney)
"Whoa are you serious?"(Fred)
"Yeah, i got an erocktion."(Barney)
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Erocktion is when an erection is really hard due to being incredibly horny or sexually frustrated
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An erection you get after listening to good rock or alternative music song.
"I got erocktion last night listening to metallica"
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