Fist Mountian is a sexual term utilize to identify a certain type of double fist penetration. Fist Mountain can be created by clasping your hands together and intertwining opposing fingers, to make the shape of a "mountain".
Jackie couldn't believe that John expected her to visit Fist Mountain on their first date, although she was happy to ablige him with simple anal sex.
by Dman5000 November 9, 2011
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