Has the same definition as dealy or dead. Deadliest is someone who is very powerful and quite deadly.
"That's one of the most deadliest person in the world."
I decided to make this a word? Anyway dumbdumber means someone is dumber then they really seem so instead on calling the dumb, how about calling them dumbdumber? I guess you can say it went from dumb to dumber.
"You're quite dumbdumber."
Just like a freakshow, but with your friends. This would be used when you have many friends or have crazy friends to put on a show!
"You guys are such a friendshow!"