To move restlessly or fidget in a small, wriggling manner; to wriggle or fuss about with small twitchy movements.
Possibly a blend or variant of 'frig' and 'wiggle' or 'jiggle,' combining the idea of fiddling movement with physical wriggling, documented in dialect speech.
Friggle is one of those wonderfully expressive words that describes exactly what it sounds like—that annoying fidgety movement kids make during long school assemblies!
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