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1.
Know Your meme (URL: KnowYourMeme.com) is the official internet meme research database with over 500+ confirmed memes.

KnowYourMeme.com has received many rewards such as the 50 top websites from TIME.com, Best Web Site from Winnipeg and also noticed by the Wall Street Journal.
Guy 1: DO A BARREL ROLL!!!! Hey wait, do you ever wonder where barrel roll originated?

Guy 2: Check knowyourmeme.com. They give you origins on a lot of memes. You can even submit your own!

Guy 1: Oh, I love Know Your Meme!
by Ronald REEEGAN January 12, 2010
 
2.
A website that catalogs popular memes. Practically every meme is on Know Your Meme, and new entries are added every day.

It is also a site overrun by Bronies. If you go into the image gallery of any meme, there is a 99% chance that you will find a pony image, even if the meme has nothing to do with My Little Pony. Voicing any displeasure over all these pony images in the non-MLP entry page will result in you getting downvoted to oblivion and probably insulted.

Unfortunately, there is not much to do about it, since the vast majority of users on KYM are Bronies. So, if you are a non-Brony, and you see a pony picture in any image gallery that isn't the MLP image gallery, just downvote the image and move on.
Internet user browsing Know Your Meme and commenting on an image:

User: What the hell is up with all these MLP pictures? This is the Video Game Logic gallery, not the MLP gallery.

Brony: You hate My Little Pony? How dare you! Downvote the heretic!!!

User: Downvote me for stating a fact? FFS, the Bronies ruined this site...
by iduncurr April 26, 2014
 
3.
Short def: A brick wall.
Long def: Know Your Meme is a site that catalogs memes. The site is infested with weeaboos and shit-for-brains. Don't even think of voicing your opinion on there, or you'll get a sword down your throat. Yeah, their community is made up of those people. What do I mean by them being a brick wall? I mean they won't listen. No matter how much you try to get your point across, they will not actually read it. At least not rationally. They pick what they want to read and use it against you. I've been on there.
Watcher: I don't think you get my point, Know Your Meme. I'm saying you need to be constructive in criticism.
Weeaboo: le u mad?
by DoomMan83 October 12, 2014