胸糞が悪い むなくそがわるい Also written むねくそがわるい, 胸くそが悪い Meanings Expression, い-adjective disgusting; sickening; revolting; nauseating Kanji 胸 chest. Read as むな. 糞 shit; feces; excrement. Read as くそ. 悪 bad. Read as わるい. Jinuma: Japanese Dictionary · Word lists