Tanım
•Very agitated or distressed; enraged.
Etimoloji
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.