It's Actually Called Moom
Me: What's that tool you use for resizing windows via the green traffic light button?
Me: Mopie or Moox or Miggins... something.
Shawn Morrison: Yeah, it's Miggins.
Shawn Morrison: I use an app called Miggins.
Me: I dunno, I downloaded Miggins and all it did was put a video of a dancing leprechaun in the bottom right of my screen.
Shawn Morrison: Honeslty, I'm downloading that immediately.