I Don't Get It

I don't! What I'm talking about is the funny little joke Noel Gallagher supposedly played on his brother Liam. Maybe you can help me out. Liam forgot to log-out of his Facebook account, and crafty as he is, Noel hopped right on computer and changed his 'what are you doing' to this amazing little update:

"Liam Gallagher has lost his forehead and gained a six-head."

I don't get it! I swear. What is that supposed to mean!

And then I guess Liam went and deleted his Facebook because he was very unhappy with his brother. 

I'm not so sure about all of this though and as soon as get a chance to talk to the Gallagher brothers Ima ask them about this first thing. And I wish I knew Liam was on Facebook cuz I would sent him a friend request and asked him to join my save the plants cause or whatever that dumb group I'm in is about.