Woot is an interjection similar to "YAYE!" or "Woohoo!" used to express joy or excitement, usually about some kind of accomplishment¹. Primarily used by gamers, spreading rapidly to anyone who chats online.

Woot是跟“耶！”或“噢吼！”等感叹词类似一个词，多用来表达欣喜或兴奋之情（网友多用“狂喜”二字解释woot），而且多在取得成就时使用。这个词最初只是游戏玩家常用，后来又迅速传播到网聊人群当中。

Woot originated as a hacker² term for root (or administrative) access to a computer. However, with the term as coincides with the gamer term, "w00t", which was originally a truncated³ expression common among players of Dungeons⁴ and Dragons tabletop role-playing game for "Wow, loot!" Thus the term passed into the net-culture where it thrived in video game communities and lost its original meaning and is used simply as a term of excitement.

Woot这个词本来是黑客用语，指电脑的根登入系统（即管理员登入系统）。不过，因为跟游戏用语w00t外形相似，才得以在网络文化中传播，兴起于视频游戏圈，之后脱离其原意而成为单纯用来表示兴奋之情的一个感叹词。游戏用语w00t是桌面角色扮演游戏《龙与地下城》的玩家常用的一个词，是“Wow, loot!”（喔，赢了！）这两个词的缩略形式。

For example:

I defeated the dark sorcerer! Woot!

我大败了黑巫师！耶！