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.