A pathetic mispronunciation of "library," often said by those with a feeble grasp of English grammar and a tendency to say "pacific" instead of "specific" or "axed" instead of "asked." The more ghetto you are, the more likely you are to use this.
What? I can't hear you! I'm in the liberry tryin' get some movies! (As overheard in a cell phone conversation in an area where cell phone usage is disallowed.)