If someone tells you or is told is to "go touch grass", it means that you need to go outside and do outdoor activities rather than staying inside on your electronics.
A phrase said to League of Legends players and many internet-goers in general; used as an insult to indicate that a person needs to stop spending so much time on the computer and get a life outside of it.
Friend: I just got Challenger in League!! It only took like 5 years of me playing the game for 8 hours straight every single day!!!
Me: That's awesome!!! Now that you've got that all finished up, you should go outside and go touch grass for the first time in fucking forever, you degenerate loser!
1. Person 1: I write a YFM BenaPuff (Puff x Benatar) yaoi uwucutesingle maid!puff boku no pico uwu kawaii yaoi fluffy lemon fanfic!!!! 1!1!1!!1!1!1!1!!1!1!!1!
Person 2: Go touch grass
person 1:im in 9yds7gc9yzsdviydffdygbyfgvudfh and im also having sex with a bull and said bull is AroAce so its technically raping and i know im a fuckboy person 2:wtf,go touch grass