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1.
A physical state where you are more adept at tasks which are difficult when too sober or too drunk (e.g. bowling, pool, beer pong, hitting on the opposite sex)

See:
Equilibrium - a state of balance
inebriated - made drunk, intoxicate
I always start out sucking at beer pong, but there is that magic time in the night when I hit equinebrium and I just start making cups.
by Dr. 84 April 17, 2010