1. Used to describe the feeling that one experiences when waking up after a night of heavy drinking and the effects of the alcohol have not yet worn off. One may be hyper with a general feeling of well being and/or cheer. One most assuredly has lowered cognitive function and perceptual abilities yet this has no effect on the elevated mood.
2. Still drunk the next morning
Origin: The song "Hermakey" from Ali Spagnola's Power Hour Drinking game
Root words: hyper, murky
Those Jägerbombs at 4:00AM left me completely hermakey this morning and I forgot to wear pants to work