Glitching - What doe it mean when a game is glitching?

Glitching has 2 meanings. The most common is "Malfunctioning video game." See examples of how people use the terms.
Glitching is when a video game malfunctions. It commonly pertains to graphics, gameplay, audio, and other aspects of the game.

TV takes a long time to turn on or has other random glitches

PS5 Lagging with Good Connection? [Reasons and Solutions

Break the Internet: The Rising Popularity of Glitch Art

What Is a Glitch? - Usage & Meaning

How To Fix Game Glitches in Chapter 3! (Screen Shaking, Loot

Video: More Super Smash Bros. Ultimate Glitches Than You Can Shake

In a game as busted as Marvel vs. Capcom 2, these 5 glitches will

Solved] How to Fix Strange iPad Glitch Issues

ARK Lag Spikes: How To Stop Lagging — WTFast Blog

10 Best Games That Use Glitches As Part Of The Experience

What Is a Glitch Game? This Meaning!

Sonic Frontiers review: maybe it's time to slow down

Glitch - What is a Glitch in Gaming