UP
Underpowered
Example
The Star Empire is so UP in Star Realms
Really? I always win with them
UP definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "UP" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Gamers use UP when discussing items, skills, and characters that are "underpowered." In relation to other game elements, UP elements are weak and ineffective. Thus, players tend to avoid them when possible.
While gamers don't use UP as often as its opposite, OP, you may still encounter UP in gaming chat and forums. For example, a League of Legends player discussing their favorite champion may post "Yeah, Twisted Fate is UP, but I really like playing as him."