An erection you get from pure happiness. Completely non-sexual.
Guy 1: Dude, my girl got me Modern Warfare 2 before the release date!
Guy 2: Uhhh, check yourself dude
Guy 1: Don't worry, it's just a happy boner.
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being joyful in such a way that you are when you touch your penis. <3
i was so boner happy when i listened to adele... i even took off my pants.
OR
i was so boner happy when i got an A+ on my calculus test.
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