The act of sleepwalking and walking into something so hard that it wakes you up. Normally occurs when the individual walks outside, locks themselves out of the house and runs into a tree.
Man, did you hear what happened to Jacob last night? He walked outside in his boxers and hit his head on a tree. Now that's what I call a Bruns Banger!
by C.G.D. August 10, 2007
Get the Bruns Bangermug.