I was wondering what is the longest meaningful phrase made out of words containing only letters A..F – the only letters that are allowed in a hexadecimal system. After downloading some word lists I came up with the following:

• facaded facade –  a double facade
• defaced deface – when a hacked entity that was already hacked is hacked again before recovery (i.e. double defaced)
• beefed beef – the beef that is very juicy, or with a lot of marble, or it’s stinky
• be deaf be deaf, be dead, be dead – probably part of some lyrics
• decaffaced – to be overdecaffeinated

And the short story about the little deaf bee that discovered that her dad is a hated fed abusing decaffeinated coffee (probably both attended the Defcon):

a deaf baffed babe bee faced decaffaced dad: a fed! 
be dead, facaded face! bad dad!

After playing with it and wondering what the heck am I doing I decided to google around, and.. turns out I was not the first one to think of it. There are actually more similar efforts.