Sweat Burger?

This was new vocabulary for me when I arrived in France, since it is English recently incorporated into slang French (following on the heels of "un parking" and "le weekend" and "stop" and "le T-shirt" and "un short" and "le mel" [e-mail]).

"Un sweat" is pronounced "Uhn sweet" and it means a sweatshirt. Based on this advertisement, I don't think they realize what sweat is. If they did, I don't think they'd type that word right above a hamburger that is supposed to look and sound tasty.