Before the fight, the two boxers were shit-talking each other to try to provoke one another.

shit-talking 是由 shit（俚语，指"废话、垃圾"）和 talking（"说话"）组成的复合词，字面意思是"说垃圾话"。 shit-talking 在口语中指带有挑衅、侮辱性质的言语攻击，目的是激怒对方或显示自己的优势。