Meaning

1 senses
  1. (idiomatic, informal, not comparable)Very agitated or distressed; also, very angry; enraged, furious.

Origin

From fit (“proper, suitable; prepared, ready”, adjective) + to (infinitive-marking particl

From fit (“proper, suitable; prepared, ready”, adjective) + to (infinitive-marking particle) + be (auxiliary passive-voice verb) + tied (“attached or fastened by string or the like; bound”, adjective), probably referring to someone being so agitated or angry that they need to be physically restrained to prevent harm to themselves and/or others.

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fit to be tied — meaning, examples, forms, synonyms | Krumeto