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1.
The condition experienced the day following extreme over-consumption of beer, when symptoms of a concussion are exhibited; e.g., head pain, dizziness, loss of coordination, double vision, vomiting, nausea, memory loss.

Akin to a normal hangover, but specifically due to beer consumption.
"Bro... I downed so many Milwaukee's Beasts last night at the kegger, that I think I have a beercussion!"
by Lord Thrust February 04, 2013
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