(n.) One who officiously concerns himself with the affairs of others; a meddling person.

Paul Pry Peeping Tom a tale-bearing animal backseat driver butt in butt-in buttinsky eavesdropper fool gossip gossip columnist gossiper gossipmonger horn in informer inquirer inquisitive inquisitor interfere interlope intermeddler kibitzer make meddler monkey with mouse newsmonger newspaperman nose nosy Parker peeper poke pragmatic pragmatist prier pry querier querist questioner quidnunc reporter rubber rubberneck rubbernecker rumormonger scandalmonger scopophiliac sightseer snook snoop snooper tabby talebearer taleteller tamper with tattler tattletale telltale tittle-tattler voyeur yenta