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TodayIFoundOut.com concludes that joke, born out of merchant slang and Black-American culture, eventually made its way to the wider American lexicon in the 1970s and 80s. Following the novel’s publication, the phrase did not reappear in the public lexicon until 1973 with the publication of the Black Language by Malachi Andrews and Paul T. Owen. They write:
Chicken Butt- When someone calls out, “What?”, because they didn’t hear, a reply might be the rhyme, “Chicken Butt.” It means forget it; I am not going to repeat it. Junior flip usage.
Mentions of the phrase also carried into the Internet era. On September 25th, 2003, for example, Urban Dictionary user Handsome Pete defined “chicken butt” as “A rhyme-arific and obnoxious way to respond to the obnoxious & ubiquitous question, “Guess What?” A much easier response than actually trying to guess the topic about to be brought up.”
The 2000s-era internet supplied a number of “chicken butt”-related memes, from viral videos to image macros. On January 6th, 2008, YouTuber icephoenix23 posted the joke in a video that received more than 35,000 views in less than 13 years (shown below, left). Months later, on October 22nd, 2008, YouTuber jcj5Tahoe posted a song based on the joke that received more than 330,000 views in less than 13 years (shown below, right).
The meme also inspired Rage Comics that feature variations of the joke, like the one published by iFunny user GenericFatKid_2016 posted a version on December 12th, 2012 (shown below).
Ironic Usage
In 2021, the phrase experienced a meme resurgence that is similar to that of 2019’s Joe Mama resurgence. In this case, memers use the meme as an intentionally cringey joke for image macros in which people take the phrase overly seriously. On January 25th, 2021, for example, Instagram user @lolhylian posted a two-panel image macro of Dwayne Johnson with the joke as the caption. The post received more than 26,000 likes in less than three days (shown below).
Various Examples
Source: https://knowyourmeme.com/memes/whats-up-chicken-butt