[dogbyte12]

Cheese eating surrender monkey bump.

[smith288]

Bart: Mrs. Krabappel, I'm done failing the test.  Can I _please_ go to
       the nurse?

Edna: Gosh, Bart, maybe you really are in pain.  Well...it would be
       cruel not to let you go.
        [files her nails, hums the national anthem]
        [hums part of "Stars and Stripes Forever"]
       Heh heh heh, _now_ you may go.

Bart: [walking into nurse's room] Lunch Lady Doris?  Why are you here?

Doris: Budget cuts.  They've even got Groundskeeper Willy teaching
       French.

Willy: "Bonjourrr", you cheese-eating surrender monkeys!

[Snerfling]

The best nationalistic slur out there is not our's for the French, but the Australian's for us:

Seppos.

Don't get it? The etymology is thus:

Yank rhymes with Septic 'Tank' = Seppo.

Get it? BTW, it's never said condescendingly; on the contrary, it usually uttered over a couple of bears down at the beach as in, "you bloody Seppos get all the girls".