This is straight from urbandictionary.com : Bill Murray : What "urban" types call people they don't know by name. Based on the "Bill Murray" skit starring Wu-Tang Clan's RZA and GZA (and, of course, Bill Murray) in the Jim Jarmusch movie "Coffee and Cigarettes". I mention this because at work my friend Adam calls our friend (Michael) Bill Murray. He will be like "what's happenin Bill Murray?" Below is the aforementioned skit (Delirium) from the awesome Coffee and Cigarettes by Akron's own (yes he is not from c-town but close enough) Jim Jarmusch.