A bruise on the inner thigh caused by a rapidly expanding erection whereby the tip of the penis impacts forcibly into the leg.
by Blackcox44859 August 08, 2013
Armando: What the hell is that on your leg?!
Manda: That's the boner bruise you gave me last night... asshole.
Manda: That's the boner bruise you gave me last night... asshole.
by Plowman September 22, 2007
Brittany: 'Do you want to go on a bike ride today?"
Me: "No, I have a huge boner bruise from last night."
Me: "No, I have a huge boner bruise from last night."
by britkav July 14, 2012