It does not. It stands for April Fools, the logo itself is from the April Fools joke and people are just using it with their own name and thing. What they created from the joke is a different story, but its a FACT that DBAF is in origin nothing more than a 1997 april fools joke about a new DB series airing in 2004
Alternative Future, Another Future, After Future, its all made up by the fans using the april fools logo design. Yes tehre were images of SSJ5 and what not before the joke, but the joke started the whole AF avalanche. And no mater what name you heard it under it all has one thing in common, they are all made up by fans.
http://dragonball.wikia.com/wiki/Dragon_Ball_AF
http://www.daizex.com/general/feature/af_prank.shtml