NERF（以大寫作為NERF商標）是帕克兄弟和孩之寶公司目前所擁有的玩具品牌。NERF商標意義為“非發漲海綿”（英语：Non-Expanding Recreational Foam）的縮寫。
同事傳 Wiki 給我:
In video gaming, a nerf is a change to a game that makes something less effective or desirable. The word can be used as a verb to describe that change.
The opposite of nerf is buff.
Buff is the term generically used to describe a positive status effect that affects mainly player or enemy statistics
Debuffs are effects that may negatively impact a player character or a non-player character in some way other than reducing their hit points.
結論: Nerf = 弱化, 減少的意思... @_@; 這些年輕人用的語言, 老人家聽不太懂.