Noun to describe a person who is absolutely bunkering insane mad crazy nuts.
Did you see Steve jump through that 57th floor window, do a back flip and land on a uni cycle and ride off into the sunset? He's bonkering mad that man.
when your train of thought is disrupted by a beautiful woman walking by and you can't finish your sentence and or work. when you have pussy on the brain... for a little or all day.
"I haven't done any work this week they moved my cube next to the hottest puma..... i have a serious case of boxbrain"
One who is of little intelligence and/or someone who acts in an unpleasant manner, a derogatory term as to compare someone to a penisinside of a brain.
I was building a giant horse dick in Minecraft and he blew it up with TNT, what a Bonerbrain!
The repository of knowledge one retains but doesn't realize one has until such knowledge is necessary in a given situation (e.g. recalling the name/face of an old acquaintance/friend/girlfriend)
"I was walking to work and some guy asked me where I went to school; I thought he was a creep until my backbrain kicked in and I realized we lived on the same floor freshman year."
"I couldn't figure out why she slapped me until my backbrain kicked in and I remembered that I slept with her best friend a few years back."