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3.
Used as a non-sequitor to distract or purposefully derail a conversation. Most notably forum users or trolls will use bonjour in a sentence where it makes no sense so as to illustrate that their opinion is irrelevant and does not add value to the conversation, usually mocking another user for inputting their own opinion as fact.
User1: Hey guys, let me tell you about this awesome vacation I had!
User2: I'm glad you want to share! Tell us about all the BONJOUR you had.
by Philip the Water Tank January 25, 2011
 
1.
The french word to say hello.
Bonjour !
by Someone July 22, 2003
 
2.
A nickname for large breasts, particulary those that are all up in your face.

They often come in handy when approached by French men.

When you need to use them to your advantage, you show them off. For example, "When in doubt, Bonjour it out"
Lorena's bonjours just pop right out of her shirt.

Guys enjoy when Lorena wears her bonjour shirt.
by G-eye-na May 18, 2010
 
4.
a congratulatory word meaning bravo or well done.
"Bonjour" Ben said after the three boys smiled and said cheese.
by rko August 21, 2006