The hilarity of the ensuing permastun pwnage upon obtaining two sets of Cranium Bashers on heroes such as Troll Warlord and Mortred in the online game DotA.
Something that is pleasing in a greatly amusing manner. Derives from the word fantastic, meaning fantasy-like, only to exist in dreams or the imagination, and the accronym ROFL, which stands for Rolling On the Floor Laughing.
person 1: Say, Pete, did you see that there's a banana hammock sale going on at the Salvation Army?
person 2: Rofltastic!
person 1: That n00b Olly went out with a transvestite he met online!
person 2: Rofltastic!