Nerfball rodeo 

when a guy and girl are screwing doggy style and the man has asked a few of his freinds to hide all around the room with balls and when he shouts "nerfball rodeo" they jump out and pelt him and her continueously with the balls all while he is timing how long he can keep his cock in her (go for highscores)

man when joe asked me to nerfball rodeo him and sally i could resist getting johnies help

Nerfball rodeo by gasmask man N May 6, 2009

nerdball

A nerd with an odd but unmistakable air of cuteness about him/her. The traits of a nerdball are the same as those of a normal nerd, but are somehow endearing instead of irksome.

Nerdball: (engrossed in playing a game on graphing calculator)

Fawning girl: Ahww, what a cute little nerdball!

nerdball by chiciebee August 19, 2011

nerdball

Funny to a good quality, and humble about it.

I'm a total nerdball.

nerdball by Hose' June 22, 2005

Nerf Ball 

A condom that has been used, and after sex, the bloke leans out of the window, (or aims at a place with people) and chucks it at them. Similar to the normal nerf ball, as in it is weighty at one end, and flys like hell! Appropriate scoring can be made for accuracy and distance of throw.

Bloke 1: "I was making love to my girl, and then when i came, I took it out, leant out the window, and nerf balled the kid in the garden next door!"
Bloke 2: "Awesome! Head Shot?"
Bloke 1: "Of course"
Bloke 2: "Wicked, the full 10 pointer then!"q

Nerf Ball by TommytheTank July 5, 2009

nerdball

noun
A form of conversational masturbation centered around niche subject matter and characterized by obscure-knowledge gamesmanship, hypothetical scenarios, and ingroup/outgroup verbal coding. Frequently results in the derailment of more balanced and inclusive group social interactions.

verb
To engage in nerdball.

NOTE: Conversation topics qualifying for nerdball are fluid and context-dependent. They may include, but are not limited to, superheroes, science fiction and fantasy, TV shows, sports, fashion, academia, science, and politics.

The party was fun until Jack and Kevin started playing nerdball at the dinner table and alienated all my work friends.

nerdball by skretch May 26, 2014

nerf ball head 

when your head feels fuzzy and soft due to a head cold

This cold is brutal; I have nerf ball head.

nerf ball head by Godiva Goddess November 9, 2015

Nerdballer 

Noun
1. A person who participates in competitive games that are niche and most often, though not exclusively based on fiction. Examples include Quidditch, Battle Games/LARPs, Jugger.
2. An attendee of nerdball events.

"I found out why Nick doesn't come to watch rugby with us. He plays Exodus on Friday nights. Never knew he was a Nerdballer."

Nerdballer by JPtheLARPelf April 2, 2020