In Mexico it was the phrase "Tu madre..." with anything else added to it. It means "Your mother..." Fight absolutely guaranteed. Insulting people's sisters was quite dangerous too. I saw more fights in 3 months in Mexico (all between local Mexican youths, not visitors) than I did in North America in 10 years. Most of those fights occurred in the evening at dances and such events, when the chicos were out cruising and looking for girls. Mexican boys are mean fighters.

- LH