it basically a way to say you've been pwnd in a videogame say it when when u own noobs or if in a clan match in Killzone COD4 etc. say we rape cause we care

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.