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1 definition by Mr Pelon

 
1.
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