Wiktionary
cheese-eating surrender monkeys
n. (context humorous derogatory English) The French people.
Wikipedia
Cheese-eating surrender monkeys
"Cheese-eating surrender monkeys", sometimes shortened to "surrender monkeys", is a pejorative term for the French people. It was coined in 1995 by Ken Keeler, a writer for the television series The Simpsons, and has entered two Oxford quotation dictionaries.