Not the standard usage of the term, as in when your head gets a cold sensation from drinking something cold too quickly. While out last night with friends, someone mentioned that they had a brain freeze, and due to the dorky and awesome nature of the conversations we’d been having, I immediately alt-defined it. So.
Def.: becoming “stuck” in a particular mood or persona, or on one thought, in one’s head. Like when a computer freezes, but in your brain, because brains are really just computers in your head. Yep.
Usage: sometimes after one has been doing something or being a certain way for long enough, it is easy to have a brain freeze and continue to do or be said way even if it is not situationally appropriate.
–your fangirl heroine.