Definition of nerfing:
(v) :
(transitive, slang, video games) To change a mechanic, an ability or a character in a video game in order to make less efficacious.
(n) :
(slang, video games) The deterioration, weakening or worsening of a character, a weapon, a spell, etc.
(v) :
(transitive, slang) To arbitrarily limit or reduce the capability of.
(v) :
(motor racing, transitive) To bump lightly, whether accidentally or purposefully.
(n) :
(computer graphics) Acronym of neural radiance field.