Top Definition
Building a fort refers to the act in which you tie up or other wise restrain your partner in a sexual manner.
Greg "Hey dude can I borrow some rope?"
Tom "Of course. But why do you need rope?"
Greg "Well Samatha and I are building a fort tonight."
Tom "Ohhhhh okay just don't get any stains on it."
by Mrblue520 February 08, 2010

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