Top Definition
Synonym of fourth base.
More specifically, when two people go to the fourth floor on an elevator. The power goes out on the way and the elevator falls. Thinking it's their last moments of life and wanting to lose their virginity before they die, they have sex. The power comes back on and they reach the fourth floor. Afterwards it is always awkward between them.
"We went to the fourth floor while mopping yesterday."
by Bobajiji December 23, 2005

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