pedro: dude look at this kids backpack  jon: wtf is up with that?  pedro: i think he has a backpack boner
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" What is the definition of "backpack boner"?