Definition of duck's ass in English:

duck's ass

noun

  • another term for ducktail
    • ‘His fine quiff sweeps back dramatically from his forehead down to his comfortable duck's arse.’
    • ‘He had dark hair, combed in an elaborate duck's ass, which for some reason didn't look silly on him, and he slouched against the wall with far more grace than his similarly garbed compatriots.’