look up any word, like muddin:
 
3.
A simple statement used to silence and alienate any boring or uninteresting story.
Gary: "So my brothers were playing socker and they..."
Victoria: "Rule 99..."
Gary: *silence*
by infected2321 March 27, 2010
 
1.
Every video of Russia is always dreary on top, white on bottom and something smacks into something else. Occasionally if you're lucky you'll see something explode.
OP never said this was from Russia, because of Rule 99 we all just knew.
by SubbyG February 17, 2013
 
2.
No matter what you search for in Google Images, at least one result will be a porno
- I Googled Barney, and I'm getting some raw hardcore. WTF?

-Rule 99.
by afjhsdljfhsoadfih October 08, 2010
 
4.
No matter what you watch on YouTube, you always end up on ponies.
Always.
Friend 1: I was watching a video on YouTube about how to make a sandwich, and started following the related videos. Somehow how ended up on a video where a yellow pony said "I'm the world champ y'know." and squeaked.
Friend 2: Rule 99.
by High Warlord Skar February 25, 2012