An insult or insults that are sufficiently offensive to the insulted person that he/she becomes angry enough to start throwing punches.
Person 1:  Too bad your mama didn't drown you when you were born, you worthless nigger/kike/camel jockey/bitch/cracker/gook/insert chosen offensive word(s) here!
Person 2: I'm gonna beat your ass! Them's fightin' words!
Person 2: I'm gonna beat your ass! Them's fightin' words!
by Evil Tim June 18, 2004
Get the fightin' wordsmug. by The Return of Light Joker October 19, 2007
Get the fightin' wordsmug. 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!
Southerner: (draws gun) Them's fightin' words!
by dilary huff August 20, 2007
Get the them's fightin' wordsmug.