A tourneyfag of a profound competitive nature is a person who feels that "fun" ruins any aspect of competition from a given video game, and thus any articles that may provide a random occurrence or event within a video game must be removed (or disregarded where appropriate).
Tourneyfags in every sense of the term are complete opposite of generally accepted and widely regarded "tournament players" of any given sport or event who, play by a predetermined, entirely approved set of rules, which are official, and govern each player competing. Within these rules they do not allow for self governing, a referee and/or judge takes upon that responsibility.
1. They play the game purely to 'measure skill' than for entertainment.
2. They remove elements that 'unbalance' the game because they care about winning so much.
'Tourneyfags' are generally seen as a disgrace and an embarrassment to the game industry. They feel a need to enlarge their egos by winning. One example of a game with a notable number of 'tourneyfags' surrounding it is Super Smash Bros. Melee.
2. "Only tourneyfags take this game seriously."
Contrary to popular belief, Tourneyfags usually have much more fun playing by their rules, and aren't just setting down the rules so that they can win regardless of the fun factor. This false belief is especially perpetuated against Smash Bros Tourneyfags, as they turn items off and don't go to stages with obstacles that randomly kill people.
This term is most often used by people who suck at a game or play causally so that they don't feel completely inferior to the person who just took them to school.
Tourneyfag's don't like having fun; they always turn off all the items!!1!