them fighting words 

The phrase that inevitably follows when there is a debate over which video game is better.

Guy 1: 2 is better than 1, man.

Guy 2: them fighting words. . .1 is clearly better than 2.

them fighting words by Ereck Flowers August 31, 2018

them's fightin' words 

An old-time expression interjected after one is on the receiving end of a harsh criticism. A fight will usually occur as a result.

Northerner: You're a dumbass from the south, and so is your slave beating mother.
Southerner: (draws gun) Them's fightin' words!

them's fightin' words by dilary huff August 20, 2007