Guy #2: BLAF? Who's that?
Guy #1: Dana White, dude.
Used in mma circles, especially the UnderGround Forum at mma.tv, to describe someone who is not actually an mma fighter, but is built like one. Reputed origin is an article describing Dana White, President of the UFC, as "built like a fighter"; hence, to date, blaf has most often been used in reference to Dana White.