It's not, it's a word off some random comic now used by 4channers (and the rest of the internet, as usual) to insult people (usually Westerners) who love Japan and "try" to be Japanese, like claiming to be Japanese and watching Japanese anime when they really only watch English dubs of Westernised anime (such as Naruto). Said weeaboos usually try and act Japanese by saying really overused crappy words such as "desu" (is, basically), "kawaii" (cute), "baka" (idiot), "neko" (cat) and other such words. They also believe Japan is the world's best country evar desu and generally diss their own culture to try and be as Japanese as possible.
They fail.