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 September 6, 2013
Get the Boner bruisemug. 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 July 20, 2008
Get the boner bruisemug. 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 18, 2012
Get the boner bruisemug.