I can't guarantee it, but I think it's from Alice's Adventures in Wonderland (and we know Gygax loved it because of the EX modules).
Remember the Mock Turtle section (and the Mock Turtle's Song)? Well, a snail is asked to dance. The dance would cause the snail to be thrown (from England toward France).
And France, of course, is where they eat snails. The Mock turtle does mock, or, I guess, taunt the poor snail.
That's a lot of unpacking for a single spell component, by the way. I would tell you to stop asking great questions that require in-depth answers, but at least it keeps me from writing more essays!