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An M-string (alternatively man-string) is a type of thong, a narrow piece of cloth, leather, or plastic that covers or holds the cock and balls, passes between the buttocks, and is attached to bands over the shoulders and just covering the nipples for discretion, worn as swimwear by Sacha Baron Cohen's Borat character.
Checkout that Bujar in the m-string, that is just nasty.
by kayodei November 16, 2007
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