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1. A toy made by Hasbro Starting in the 1970's. (in 1969 they had a foam ball) nerf guns in the 70's shot foam balls, now they shoot foam darts.

2. To decrease one's power in video games because one is too overpowered.
1. Ryan: Hey Tom, im going to have a nerf war, wanna come?
Tom: Sure!

2. Dude the Ray Gun was AWESOME in Black Ops 1. Now in Black Ops 2 they nerferd it. now it cant do shit.
Nerf by Epicryan158 September 16, 2013
Related Words
The term "nerf" comes from the online gaming world of Ultima Online.

At one point in the game, the developers reduced the power of swords in melee combat.

This resulted in players complaining that it was like they were hitting each other with nerf bats, not swords.

From then on, if ever something gets made less worth while than it had been originally, it has been considered a 'nerf'.
"Oh man, they reduced the dmg on the berserker class and now it's totally nerfed!"

"Damn, the Devs nerfed those axe's real good!"
nerf by Dave Elliott July 19, 2005
Any change to a game element that makes it considerably less powerful or desirable.
Floyd: Don't put the Nerf on my team, just to try and slow me down.

Beth: Oh, come on im good *Shoots self in head*.
Nerf by qwerty96 July 5, 2012
Something blizzard does to Rogues every patch.
Man, Blizzard Nerfed rogues again!
What else is new?!
nerf by Buffrogues November 30, 2006
Nerf is an anagram for non-expandable recreational foam, used in things like stress toys and as projectiles of some toy guns, great for firing at people around the office, although I would recommend that you work in a relaxed working environment first, as a stray foam projectile in your bosses coffe could lead to your dismissal.

This can also be used to describe a shot in a game that caused little harm (as with the foam projectiles).
Player 1: Yay! Direct hit! That must've hurt!
Player 2: Nah, you just nerfed me.
nerf by GarethPN June 24, 2007
When Greninja from Smash Bros. is too gud and needs to be more worse