Top Definition
A dimension you enter while under the influence of marijuana. First discovered in the left corner of a shed. Commonly used for describing getting baked/being stoned.

If you are in the 4th dimension you are so high you think you have the ability to enter other dimensions around you.

You are Christopher Columbus- and everywhere you look is a new world (dimension)

Entering the 4th dimension would be like walking through the wardrobe into Narnia.
Girl: When was the last time we were in the 4th dimension?
Guy: I don't know but we should visit!

Girl: Did you just enter the 4th dimension?
Guy: No... the third and a half.
Girl: I'm packing another bowl.
by miaistheshit January 02, 2010

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