A combination between the slangs "Cya" and "Yall" and is used as a sort of goodbye to a group of people instead of only one person. It's most commonly used between Roblox, and Gta player, but is not particulary limited to any specific community.
Yo, dudes, I gotta go, you can finish without me right?
Yeah sure man we got this bro!
K, Cyall bros.
When you're waiting for what feels like ages for someone to peek the window or around the corner, and the exact moment you look away or reload, they come out and kill you.
I hate Call of Duty Timing, dude! They always peek right as I go away.