http://knowyourmeme.com/memes/reeeeeeeAbout
“REEEEEEE” is an onomatopoeic expression of
intense rage or frustration typically associated with the Angry Pepe character and used by those who frequent the /r9k/ board on 4chan. The expression is often associated with the Autistic Screeching meme, however it is intended to represent the unique croak produced by several species of frogs when agitated.
Origin
Certain frog species are known to produce a shrill scream noise to ward of predators when threatened.[12][13] On October 25th, 2009, the earliest known video of this behavior was uploaded by YouTuber ppparaone, which gained over 2.5 million views and 4,600 comments in the next six years (shown below). This video would later one become even more popular with a screenshot of a comment, and spread to humor content aggregator clickbait websites such as Buzzfeed [14] or Smosh [15].
Video screen grab of amazing frog that scream weed poop
The earliest known archived use of the onomatopoeic version of the scream was submitted to 4chan’s /r9k/[7] board on December 27th, 2014, featuring an image of Pepe the Frog accompanied by the message “REEEEEEEEEEEEEEEEEEEEEEEEEEEEE” (shown below).
first known use of the REEEEEEE phrase online
Spread
On January 23rd, 2015, a series of posts with Angry Pepe images featuring the cries of frustration appeared on /r9k/.[6] On January 31st, a thread was submitted containing a picture of Pepe vomiting along with the expression, to which other users replied with audio clips of themselves making the screaming noise. Over the following weeks, additional posts were submitted featuring the onomatopoeic expression.[9]
Angry Pepe versions of REEEEEEE memes
On February 21st, a Redditor submitted the question “Why do people on 4chan’s r9k say ‘REEEEEE’ all of a sudden?” to the /r/OutOfTheLoop[16] subreddit, to which Redditor Dragon___ replied that the sound was similar to shrieks made by autistic people (shown below). On March 19th, Redditor Taaqif submitted another question about “Reeeeeee” comments to /r/OutOfTheLoop.[17]