"Olofboost" refers to a controversial tactic used by the professional Counter-Strike: Global Offensive (CS:GO) team Fnatic during the DreamHack Winter 2014 tournament.
In a match against LDLC, Fnatic's player Olof "olofmeister" Kajbjer used a pixel-walking boost on the map Overpass, allowing him to see and reach parts of the map that were not intended to be visible from his position.
This move led to a significant comeback for Fnatic, but it was later deemed an exploit of the game's mechanics.