Hang out with a lot of commonwealth expats, or have a couple of anglophile friends? I've heard it plenty from British and Aussie folks both expats living here and online and when I've been outside the US, but as I said, have literally never heard someone with an American dialect use it.

From a fellow yank, it would be at least as affected-sounding as calling a truck a lorry or a car's hood a bonnet.