Scrolling back and forth through time, rather than a spatial axis, and sometimes also with the ability to pause at arbitrary places. I usually see that usage in the context of video editing.

Fun fact, most game replay infrastructure is built on networking(if it exists in the game).

Replay is usually as easy as just timestamping packets(or storing input if you're running a lockstep sim) and playing it back when viewing the replay.

The time bar and "current location" elements of a video player are commonly called the "scrubber". Thus, when you record multiplayer video, you have full control over playback.

Or maybe you mean the tool that lets you rewrite your miserable failure with no kills and make it look like you won the match with no deaths.

It isn't multiplayer video, it's actually a replay that is played back in-engine.

Multiplayer demo (or replay), not video.

The name of a basic exercise for time travel ninjas: "wax on, wax off"—but on a temporal surface instead.

It's when you remove unseemly characters from history - e.g. going back in time and killing Hitler