So as of the current Overwatch PTR, typing gg ez into chat will cause the game to pull a sentence from a pool and cause you to say that instead.  The current lines are:

• Great game, everyone!
• It was an honor to play with you all. Thank you.
• Good game! Best of luck to you all!
• I’m wrestling with some insecurity issues in my life but thank you all for playing with me.
• C'mon, Mom! One more game before you tuck me in. Oops mistell.
• Gee whiz! That was fun. Good playing!
• Well played. I salute you all.
• I could really use a hug right now.
• It’s past my bedtime. Please don’t tell my mommy.
• Ah shucks… you guys are the best!
• I feel very, very small… please hold me…
• For glory and honor! Huzzah comrades!
• Mommy says people my age shouldn’t suck their thumbs.
• I’m trying to be a nicer person. It’s hard, but I am trying, guys.
• Wishing you all the best.