Go clean toilet

Expression: A phrase used in multiplayer first person shooter games, to exclaim and project someone, most likely another player, as being terrible at the game.

It is used to project that the player who is terrible, may be better at cleaning toilet bowls, since it is usually looked down upon, hence making it clear that the player have came to the lowest of lows. Could be used as satire insult.
Distant relative of the famous expression "git gud".

Dude you are actually really bad
you are so bad haha go clean toilet haha one kill.