It is a bounty that was posted by Pannenkoek2012, who is a YouTuber.  He is claiming that he will pay $1000 to any player that can reproduce an ultra rare glitch in the game "Super Mario 64."
The original, rare glitch was apparently caught during a play-through of the game on Twitch by a streamer called DOTA_TeaBag.  He was playing the Japanese version of the game. While playing the stage "Tick Tick Tock," he suddenly came across a glitch that forced him to warp towards the top of the level, allowing him to skip most of it. This glitch is considered incredibly rare, and it is especially valuable to speed-runners since it can save significant time in the stage. It is also thought that being able to reproduce it can lead to discovering other glitches in the game.
It is thought that the glitch speeds the level up so much that it can possibly be used to complete a world-record speed run of the game, hence the large reward. Pannenkoek2012's current guidelines state that anyone with a recording of the reproduced glitch can upload it to TinyUpload as a zipped .st or .m64 file, and they can link the upload to a private message or comment to him. The first person who has submitted a valid entry will be awarded the money.