Demon eye or "the demon eye" is a way to describe the condition of having a burst blood vessel in ones eye. Common side effect of puking your brains out from alcohol. Normally takes some time to go away.
Holy shit derek you threw up so much you got "the demon eye."

Derek's eye was all red but not like got high at lunch red, he had "the demon eye."
by MarkezTheMack July 8, 2017
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