That'll Learn Them Edit Meaning

1.

A way of saying "That'll teach those people a lesson, my good friend!" as a mild grammar joke.

Commonly used by gamers(usually the FPScrowd) to express triumph in the game, although the useage has expanded enough that it is not out of place to hear it from other types of people in other situations.

Game Announcer: Red Team scores!

Red Player #1: Haha! That'll learn them!