Karma Charger is a meme exclusive to the game Left 4 Dead 2. It was popularized by machinima maker and "Left 4 Dead 2 Funny Moments of Getting Owned" series director Criken.

This meme's history can be traced back to when the Charger was introduced in Left 4 Dead 2. This special infected was notorious for being spawned by the Director, attacking lone players, and pummelling them to death or charging them off cliffs/buildings. The term first appeared in YouTube user gNatFreak's video ""https://www.youtube.com/watch?v=aPTnbm1d0jU">Expert Demo Fails 2". From there the term reappeared in several videos, including ""https://www.youtube.com/watch?v=0Evdk7U0Or8">Why Modded Servers Scare Me".

Then Criken picked it up and used it in his "Left 4 Dead 2 Funny Moments of Getting Owned" series and from there it was launched into memedome. In these series, he invented the catchphrase "Karma Charger is always watching".