Double it by twice the amount (or Double Twice the Amount) is a running gag between the Creatures. It was started by Sly in episode 61 of The Ex-Communicated Series, but it was also used later on by Seamus, Danz, and Nova.
The three were talking about the infinite size of Minecraft when Sly said that the map's height was doubled by twice the amount. Nova and Seamus picked up on this and started to make it a joke. However, Sly didn't get it (just like Cloud Gaming). Danz made a reference to it on a Creature Game Nights. Since then, Sly said it more often. It was referenced again by Seamus in Episode 12 of Sarcasm with Seamus.