Top definition
The phenomenon when a males mind becomes filled with extremely sexual thoughts when one has a boner. In other words a person thinks with their boner.
I had a serious case of boner brain in class and almost spunked my pants thinking of fucking Ms. Williams
by TadBitOfThad May 10, 2015
Jun 29 Word of the Day
"OMG IM GONNA FAIL MY TEST AND MY PARENTS R GONNA KILL ME AND IM GONNA GET GROUNDED AND-"
"-hey, hey HEY."
"what?"
"WOOOOSAHHHH"
"-hey, hey HEY."
"what?"
"WOOOOSAHHHH"
by Ashley Laberge March 12, 2004
2
One who is of little intelligence and/or someone who acts in an unpleasant manner, a derogatory term as to compare someone to a penis inside of a brain.
by Duo2Cuo March 15, 2011
3
When ones intelligence level decreases as blood flow levels lower in brain to accommodate the needed increased flow to the penis during a erection.
by JDiddy2Pretty September 27, 2015
4
when one has the inability to speak or function because all of the blood has rushed out of their head to their boner. generally makes the affected person very stupid for the duration of the boner. mainly occurs to men with large schlongs.
"she told me i could touche her boobs and i wigged out, i think i said 'i don't need to.' I NEEDED TO."
"Total boner brain dude, ouch."
"Total boner brain dude, ouch."
by twiceonsundays June 02, 2011