Poor memory or inattention displayed by someone not old or adled enough to be suffering full Alzheimer's disease. Half of the poor memory usually associated with Alzheimer's.
"It was a shame how Hal acted in that meeting today after not reading the prep materials. He clearly wasn't listening to the discussion. He sounded like he had halfheimer's."
by Suga T April 08, 2008
when a married couple is working on a half of a brain.
Our half-heimers is working because I forgot to buy wine at the store but he remembered.
by Imakokopelli October 17, 2010