Well idk if this is in the right section but i was just reading siwy144 unban appeal.
Even though the guys english is crap i can kinda see where he`s coming from, let me explain..
Knife desync is when you knife someone on your screen but they dont die and continue moving while appearing to slide along the ground, on there screen you never knifed them, so they continue to walk around as normal. This creates desync in DM enviroments because you dont see the person who is knifed shooting you, meaning you dont take no damage. Happens regulary to me on DM servers.
I managed to find a video on youtube about it.
http://www.youtube.com/watch?v=0rdFCyDcyQk&feature=related