Anal Anonymity 

The belief one can release flatulence without being heard or seen.

Billy was sure he had anal anonymity in the library when he let a festering air biscuit fly, however to his dismay his girlfriend had just rounded the corner and was caught in the blast. Billy's personals ad can now be found on craigslist.

Anal Anonymity by Zappafan76 January 27, 2011

Anonymosity

The attitude of people on forums or chat rooms brought about by the anonymous nature of the internet. Previously quiet or shy people become raging assholes.

ScreenName881: Hey you're all dick loving faggots!
Otherguy525: jeez, talk about anonymosity.

Anonymosity by Petree Dish May 22, 2008

Anonymi 

On a site, more than one person is anonymous or has no name.

"Hey, did you check out my new website?"
"I loved it! But there was TONS of Anonymi on it."

Anonymi by H2r9 May 15, 2010

Anonymice 

The plural of anonymous.

People who are afraid of exposing themselves to ridicule if they comment with their real names (or known avatar name) will chicken out and respond as "Anonymous". Taken as a group, they're all just a bunch of anonymice.

Anonymice by beansforbreakfast July 8, 2019

Anonymiss

A female who posts anonymously to internet message boards, typically associated with the popular 4chan image board /b/.
Anonymiss is a direct opposition to the male dominated group of "anons" who overtake /b/. The main focus of anonymiss is to show that girls are on the internets too and boys should expect them.

Jim: Girls on my interwebz?!?
Jack: Uh oh, it's an anonymiss!

Anonymiss by Therealanonymiss June 3, 2009

anonymice 

People (typically n00bs) who insist on posting anonymously to online communities, usually just to cheese non-anonymous people off.

The singular form is anonymouse.

#1: Dang, those anonymice are annoying.
#2: You said it.

anonymice by Jordie June 10, 2005

e-nonymity 

a) Internet anonymity

b) The comfortable facelessness of the internet which tends to encourage lack of inhibition, snarkiness, porn consumption, blog writing, and various other forms of otherwise socially inexcusable behavior.

I wish I could tell Linda I'm the one who's been posting those snide comments to her blog all this time, but I know it would totally compromise my e-nonymity.

e-nonymity by JoeJReed January 14, 2008