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What does FU stand for?

FU stands for Flasher Unit

This definition appears somewhat frequently

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Other Resources:
We have 8 other meanings of FU in our Acronym Attic

Samples in periodicals archive:

We luxuriously stretched our legs in the enclosure shaped like a miniature double-wide trailer, swapped jokes, sipped pop and studied a pair of Vexilar electronic sonar flasher units that accurately enabled us to jig our tiny lures right to any fish through an immense column of 74 feet of water.