Sometimes referred to as an RAR. A reverse aerial rush is a strategy in fighting games (specifically smash bros.) where one changes the direction the character is facing with maintaining momentum in the other direction. This is used to back air at high speeds, hence the name reverse aerial rush.
person 1: “Yeah he is a good character but you have to Reverse Aerial Rush a lot, so not the best for beginners”
person 2: “oh yeah I’ll stick to my main then”