From Longman Dictionary of Contemporary Englishfighting words/talkfighting words/talksomething you say that shows that you want to fight hard for something → fight
Examples from the Corpus
fighting words/talk• And we need to warn them that the words they are using can very easily become fighting words.• Today in the 1980s many Christians don't like this fighting talk.• Where I come from that's fighting talk.• It sounds like good fighting talk but, beyond the active birth arena, I wonder how accurate a picture it represents. 