Top Definition
When someone backpack is so stuffed, and they are wearing it so high up, that its literally akward cause the fucking thing is right in your face.
Pedro: Dude look at this kids backpack

Jon: wtf is up with that?

Pedro: i think he has a Backpack boner
by retard0934234 October 03, 2011
Where a kid has so many books in their backpack, to the point where you are able to see the books protruding out. This look is often sported by the nerds of your school
Tom: "Whoa, look at that kid, his backpack is so full!"

Bill: "Yea, he has one gnarly backpack boner."
by Papa Jebediah March 31, 2011

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