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It means BYOB but fun is substituted for booze. This is done because alcohol often starts the fun. The lone Sober person at a party does not usually have any fun.
Fun is also substituted as a code word so that minors don't have to worry about adults figuring out what is going to go on at a party.
The fact that it sounds nerdy and innocent makes it ironic.
Bring your own fun to the party saturday.
Should have brought some fun.
by Louis Richards December 07, 2007

Words related to Bring Your Own Fun

byob alcohol booze fun party