noun
extraordinary strength; brute force; animal strength
Vulgar, emphatic term for immense physical power, often implying raw, unrefined force. Used in casual, rough speech.
あいつは糞力でドアをぶち破った。
He smashed the door with brute force.
糞力に任せて重い荷物を持ち上げた。
He lifted the heavy luggage relying on sheer animal strength.
Compound of 糞 (くそ, 'shit', a vulgar intensifier) and 力 (ちから, 'strength'), with rendaku voicing to ぢから. The exact origin is uncertain, but it follows a common pattern of using くそ as a pejorative or emphatic prefix.