a nice way to refer to a stupid, dumb, or even mentally retarded person or question!!! The term refers to how people have inability to think with a brain freeze and permanant cold in parts of canada, therefore a person with a canadian brain freeze is always inable to think, making them dumb!!
Steve asked "is it possible to be allergic to water" and I responded "do you have a canadian brain freeze".
When you have been working on your dissertation for a a long time (subject to your own interpretation of a long time) and you start to forget random but importantinformation.
Today , I forgot what year it was. I swore it was 2015 and an hour into working and dating everything 2015, I realized it was actually 2016. That is when I realized that I had dissertation brain. #dissertationbrain
When you ignore all good sense and reason just to have an orgasm
Jim: bro I was about to finish in my girl and she wanted me to pull out but orgasm brain kicked in and I was like "fuck no bitch" so I'm single now and in 9 months I'm bout to have a chat with Maury.......