Combination of "Terrible" and "Bad".
Adopted by and, thoroughly beaten to death, by the shittier
World of Warcraft playing community for people that they don't like. Because every society of caustic for the sake of cool, self loathing nerds needs to have their own memes and slang to fit in, WoW has this weak shit.
People who realize that "thinking" isn't their
particular strength and figure that, being witless, meme sheepish tools, an Armory check and some lame ass slang should be a good enough
replacement for tact, knowledge, facts or well thought out arguments.
Terribad, bads, scrubs, Futurama references are all
ingredients in the gigantic
shit stew that makes WoW players look like the dumbest, most
anti-social losers in Gaming.