1. A process to flush the all the current thoughts, views, headaches, and/or attitudes of an individual. Usually involving drugs, a blunt force to the head, electroshock therapy, meditation, frontal lobotomy or other brain altering procedure.
2. A strong alcoholic drink, or combination of alcoholic beverages to induce forgetting about the current situation or problem.
"This headache is killing me, I need a brain emena!"
"I know just what you need to get your ex out of your head. We will go out on town and give you a brain enema!"