A combination of the French word for hello "bonjour" and iconic Southern word howdy. The ultimate way to greet someone, especially in a Texas French class. Should be followed up with yeehaw for premium experience.
Pull apart the buttocks of your consenting sex partner, and as per the French greeting kiss each inner cheek from left to right whilst dragging your nose across their bumhole. Voila the dirty bonjour.
"Oh la la" exclaimed Angelique, as I bent her over and warmly welcomed her with a dirty bonjour.