Not sure where everyone's from, but in my experience I've heard a lot of phrases that I've had to laugh about...some I've actually had to google, then laugh about. Busting out my character map for grammar purposes here.
"Putain! PUTAIN DE + <an unintelligible long string of words no one could possibly understand>"
- I personally love this one. You throw "putain de" in front of any noun and people know you're serious.
- This was something you could hear from the kitchen regularly when I was younger. It was normally followed by "non cappice n'a cazze." and someone getting bitchslapped.
What else do you people have? Any stories?