Something that was funny, then said again and again and again till it catches on to the mainstream media and isn't funny anymore, when all the people who guffawed over it in the first place claim it "wasn't that great anyway."

Pronunciation: \ ˈmēm\
Function: noun
Etymology: alteration of mimeme, from mim- (as in mimesis) + -eme
Date: 1976 
: an idea, behavior, style, or usage that spreads from person to person within a culture 

Boom.

lol, is this thread intellectual phishing? 
 
I define meme as a concept or even a symbol that, while continually evolving, is transmitted to others through imitation and/or through media. 
 
Also google "Dawkins"

I define a meme as some stupid 4chan shit that isn't funny or relevant but seems to pop up all over the goddamn place because people on the internet will desperately cling to any stupid thing if it makes em feel like they "fit in".
 
That's what I think when I hear the word "meme". Although I don't hear it in real life, I only really see the word on forums.

I hate memes they're so annoying

it doesn't have to be funny just capable of spreading
most of the time they're annoying and are popular because of their ability to annoy

Memes doesn't afraid of anything.

This thread is certainly not over 9000.