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A parallel existence in which events may unfold differently and particles are antimatter and so forth. A subset of the multiverse.
Amply illustrated in this Youtube conversation.

Dude 1: I shudder to think that there may be an alternate universe out there in which McCain-Palin won the elections! Wait, she could be PRESIDENT in this one!

Dude 2: There is such a universe. In that universe Gore and Lieberman won. Gore was killed by an Iraqi-Iranian-Pakistani Terrorist while he was looking out a window in the Twin Towers. President Lieberman made a tearful speech declaring Gore a martyr. He the declared World War on Islam and bombed Egypt.

The US is also bankrupt in that reality.
by Vamavid November 19, 2009
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Having a kick ass orgasm while getting a blumpkin, eating a good sandwich, injecting heroin, watching an awesome film, receiving a nice message and being told you won the lottery.
tom: fred, you look so serene, man, what happened?

fred: (ecstatically) Alternate universe

tom: No....fucking....way!
by bluhluhluhshning April 20, 2010
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