(Noun) The combination of one or more Benadryl capsules with an alcoholic beverage.
(Verb) The desperate action washing one or more Benadryl capsules down with an alcoholic beverage.
Person 1: I haven't slept in days!
Person 2: Have you tried Beernadryl?
Person 1: If I go to sleep right now I'll just wake up at 5:00 to piss and not be able to go back to sleep. FUCK!
Person 2: You should Beernadryl!