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Fat End First - inserting the fat end of something into a bodily cavity. This is usually with the intent to cause pain. Anything with a fat end and a slender end can be used in this manner: carrots, baseball bats, and water bottles to name a few. Depending on the bodily cavity selected, this may result in difficulty in extracting the object. This acronym is generally used as a verb to describe the action of the penetration.
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