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.
by GarethPN June 2, 2007
Like Cow, Except in the Star Wars Universe.
Why, you stuck up, half-witted, scruffy-looking nerf-herder!
-Princess Leia
by Gun Me Down Renton November 12, 2003
to make something in a videogame less desirable
I started to grow tired of Pokémon when they nerfed the attack system. (example of nerf)
by The Return of Light Joker January 14, 2010
a term used in off road desert racing to describe the act of bumping into another race vehicle from behind to let them know you would like to pass and they refuse to move out of the way.
I was following in that guys dust and he wouldn't pull over so I had to nerf him out of the way.
by bobfaggot August 25, 2016
If you're not using that towel I'll nerf it in the wash.
by dodgyroj September 20, 2021
one who is sexually attracted to turtles
"did you see the way that turtle was giving me that shit eating grin? you think itll give me a blow job?"
"nerf."
by tusninosquirendulce March 11, 2010