Originally a corruption of the word deadly, the word dedlee now stands alone as a positive descriptor, used to emphasize nouns in an emotive manner.
Commonly used to describe very entertaining matches in Starcraft, a game of rugby involving the Cronulla Sharks, or a dragon, eg Trogdor.
OMG!!!!! HOW DEDLEE WAS THAT SHARKS GAME?!?!?!
OMG!!!!! THAT WAS A DEDLEE GAME OF SC!!!!