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FID is the acronym for "fatty in disguise". A fatty in disguise is usually a woman who uses deceptive tactics to conceal her large body mass. She will often wear black to slim her figure or wear large multicolored garments as a distraction to her prey. When online, the FID will often take pictures at awkward angles and these photos will usually only be head shots. With practice and experience, a man can quickly spot a FID and avoid wasting his time and energy.
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