Memerights are a term used to describe memes that were created by one person, and then claimed by that person as their meme, that no one else can use, edit, or use the image of the meme.
Stephan: Dude, I'm gonna repost your meme.
Drake: No man, I memerighted that. Give me 25 bucks or I'll kill you.
Meme emergency.
When you're in need of a specific meme you cannot find, forgot to save when you had the chance or while are on to go and don't have access to your meme folder.