UPDATE 17/02/14: Valve has tightened up its game-tagging after a few customers - somewhat predictably - began using the feature to create their own humourous labels for certain games.
To combat this, you can now report labels for being "offensive/abusive", "not appropriate for this product", "not a helpful tag" or a spoiler.
In general, tags will now need to be applied by more people before they become visible, while swear words have been properly banned.
ORIGINAL STORY 13/02/14: Mischevious Steam users have begun hijacking Steam's new game-tagging feature to label games with humourous tags and some colourful new descriptions.
In news that should come as a surprise to no one, users have decided to exploit Valve's new cataloguing tool to troll others - and air their thoughts on particular titles.
Search for "casual" games and you'll be rewarded with Dark Souls and the upcoming Thief.
Deadly Premonition's top label is "beard simulator", while indie hit Gone Home's most popular tags are "not a game", "walking simulator" and "bad".
DmC Devil May Cry, a frequent target of gamer ire, is "edgy" "#TooEdgy4U" and simply "f*** you".
Fez is described with the tag "choke on it" (one of the many memorable phrases from developer Phil Fish's Twitter tantrums) and "diva dev" (which also appears as a popular choice for Peter Molyneux's Godus).
Steam's game-tagging FAQ suggests that there is nothing publishers or developers can do about unwanted tags. In answer to the question "What if I don't agree with a tag that has become popular for my game?", the company explained:
"Tags can be a good indicator of when there is a mismatch between how you perceive your game, and how your game is perceived by customers. Often this is simply because there is some piece of information regarding the game that customers feel is missing from the store page."