(n)When ones penis is at the midway point of being fully erect, yet it does not fully hard and protruding upward, thus creating the illusion you have a very large flacid penis.
"As I showed them my cock, they thought it was huge because of the fact I had a mini boner, yet they thought that was the actual flacidity of my penis."
by kasjdhaksjdh January 09, 2008
Guy 1: yo, danny has a small penis!
Guy 2: isn't his nickname Mini Boner?
Guy 1: yeah, he can't chop girls with that mini boner...
Guy 2: isn't his nickname Mini Boner?
Guy 1: yeah, he can't chop girls with that mini boner...
by Daho October 17, 2010