An unexpected action that you would never expect that yields an above average positive result. the term originates from glitches video game speed runners who use glitches to outmaneuver obstacles where as people find "real life glitches" to outmaneuver real life problems.

When you use a Playstation controller as a makeshift vibrator.

when you do something stupid that happens to work out well

this is something that a gamer does when they want to do something very cool to impress their friends,impress the person that they like or just trying to act cool

when a girl sits on your face while she gaming

Going on Urban Dictionary or playing video games instead of whatever the fuck is productive and helpful. Basically procrastinating, but for gAMeRs