A sex game that is played with two or more people. The rules are simple, while in the middle of a sex act one person, who will play the part of the mad hatter, yells "Change places!" Everyone then must rush to switch positions and or partners. The same position cannot be used twice with the same partner. This is a reference to the tea party scene in the Alice in Wonderland book.
John and Cindy liked to play mad hatter on Saturdays to spices things up.
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