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The gap between a woman's upper thighs. It varies between a Pamphlet or Gideons (a nonexistent or narrow gap respectively) right up to the rare and priceless King James Family Heirloom (a gap so wide as to allow a clenched fist to pass unobstructed).

So named because it facilitates the position of the Missionary.
By means of the young lady's prodigious Bible Gap, her cameltoe (q.v.) was visible from behind even when she was at (and thereby commanding...) full attention.
by theVictorian January 08, 2007
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