Glitch

Glitch is a programming error of a game, which results in behavior not intended by the programmers.
Glitching is the practice of a player exploiting faults in a video game's programming to achieve tasks normally impossible if the game's script runs as intended, such as running through walls or defying the game's laws of gravity.
It is often used to gain an unfair advantage over other players in multiplayer video games. In speedrunning, Glitching is widely used in order to reach the best time.
Part of the quality assurance process (as performed by game testers for video games) is locating and reproducing glitches, and then compiling reports on the glitches to be fed back to the programmers so that they can repair the bugs.