when a person as an abnormally big ass head that it looks like your head has a boner. It sticks out in the back
Zach has a big assssssss head boner bicthhhhhhhhhh
by head boner February 28, 2017
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a boner in which looks like a hourglass where the middle of the shaft of the penis is skinny with a wide base and big head.
Sally: Johnny's eagle head boner ravaged my womb last night!
by TymeWaster January 5, 2009
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