completely worthless; utterly useless
A strong, derogatory set phrase meaning something or someone is of absolutely no use. The literal image is 'not even useful as shit.' Used in informal, often angry or dismissive speech.
That guy is completely worthless.
This manual is utterly useless.
Standard kanji-kana spelling for this fixed expression.
Kana spelling of the first part; sometimes used to soften the visual impact of the kanji 糞.
Katakana spelling of the first part; adds emphasis or a rough, slangy feel.
A fixed derogatory expression combining 糞 (くそ, 'shit') with the phrase 役に立たぬ ('not useful'). The literal meaning is 'not even useful as shit,' emphasizing total worthlessness.