A severe inconvenience when an unsolicited erection occurs in school. The inconvenience is magnified in the presence of basketball shorts and presentations in front of the class.
I got a school-boner today. I dont know why it happened, but it was uncomfortable.
by Carlos1174 May 26, 2010
An erection that occurs during class as a result of either daydreaming or seeing a hot girl, usually experienced by adolescents and preteens.
James: "Damn, that girl over there has a nice ass."

Bryan: "Yeah, I just popped a schoolboner when she bent over to pick up her pencil."
by Mr Pelon January 17, 2012

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