I just heard someone in the show "Lupin" say what sounded like "merce" instead of "merci". Is "merce" an actual truncated form (like "ta" in English), or did the actor / character just trail off at the end of the word because she was distracted ? (It's the cop who's just taken Lupin into custody, & is transporting him by car, & she's talking with a petrol station attendant.)
Also, how common, & how slangy is "cimer" ?