yei yei kahila - whatever he spoke; prabhu - Śrī Caitanya Mahāprabhu; sakali khaṇḍila - refuted everything; uttara - answer; nā āise - could not come; mukhe - in his mouth; mahā-stabdha haila - he became greatly stunned.

Whatever arguments he put forward, the Lord refuted them all. Finally the person became stunned and could not speak.