It is few days now after the latest patch when many players experienced this not very fair exploit or hack. If you have not seen it then just skip it and enjoy your lucky days because even ranked games were influenced. Making penta kill were very easy and oneshot anyone became practically a certainty.
Fortunately everything should be fixed now.
Hence enjoy the videos below how you were able to abuse it.
League of Legends BOTRK Hack EXPLOITED November