Originating from South-East Europe this word is used as a substitute for the word retard. It is deeply offensive and should be used rarely in 'extreme' cases. The word gained its popularity in DotA - a Warcraft III modification but quickly spread amongst other gaming communities.
OMG dude I kept repeating and repeating so he can understand and what a surprise...he did the opposite! WHAT A KRITA!
Don't go alone you'll get killed. Oh, no RUN...you died, you KRITA.
Dude, I had a full inventory of level4 items and he only had boots. How can't you call him a KRITA ?