Means easy game and is used to annoy other players particularly of the other team after a lengthy match. It is regularly used from Pro CS:GO player NiKo.
by MONXX15 December 16, 2017
Russian slang meaning "ez game" (katka=game). Popularized in games such as DOTA and League of Legends. Used by people to annoy their online opponents after lengthy and difficult games.
by Eckersley July 30, 2016