Canard

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Okay, I know the title is a bit mysterious but I find it amusing! If you don't have a girlfriend, you won't hear it a lot, but it is still something popular in France.
Think about a duck. Not a real one, but their behavior. A little duck, or even a chick (in the duck meaning, not girl one). The yellow chicks tend to follow their mother at all costs in a really cute way.
Now, here comes the expression: "C'est un canard ce gars." (This guy is a "duck".). It means basically that this guy, with a girlfriend, is "following" too much its girlfriend to the point he overdoes it and basically, the guy is currently manipulated by the girlfriend. Examples: when offering "too much" gifts. Or so on.