slanging match
From Longman Dictionary of Contemporary Englishslanging matchˈslanging ˌmatch noun [countable] British English informal ARGUEan angry argument in which people insult each otherExamples from the Corpusslanging match• Anyway, so you had a slanging match.• No-one wins a dispute with Graham, so there's hardly any point indulging in a slanging match.• Then Vivienne joined in and the three of us had a big slanging match.• But local radio stations have joined in the slanging match over aid.