Row. Rhymes with cow. "Blimey, all I said was that her bum had gotten a bit wide, and then we got in a frightful row."
Late Note: According to the comments, a bloke who says 'blimey' would probably never say 'frightful' (too high brow) unless of course they were making fun of someone posh who does say frightful. So it should probably be more like "Blimey, all I said was that she'd got a bit broad in the beam, and then we had bleedin' row," or perhaps "Look here, I simply pointed out the obvious about her um, lower end, you know, and then we had a frightful row."
And we'd just say 'had an argument' (posh) or 'got in a fight' (not posh) or possibly 'hairweaves a flyin' (Jerry Springer).