Pulling an Oxy
"Pulling an Oxy" or to "Pull an Oxy" is the act of being somewhat competent at a competitive video game, typically a multiplayer game, then choking up and failing often in spectacular fashion at the last and most crucial moment.
"Man, I almost had that squad knocked, but then I caught myself Pulling an Oxy!" or "Why'd you go and Pull an Oxy in that last fight? We almost won!"