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On December 4th, 2020, /u/Arjunsb01 made a post to /r/DankMemes titled, “Bonk” in which he shows the image of Busty Aunt Cass next to the un-photoshopped version for those unaware, garnering over 16,000 upvotes in three months (shown below).
The image of Busty Aunt Cass has been re-posted numerous times across the web, but didn’t go viral as a meme until late February 2021.
On February 27th, 2021, Redditor /u/organic_crystal_meth posted an image macro to /r/DankMemes featuring an image of Busty Aunt Cass talking to her son Hiro (shown below), an edit of an earlier image macro format that shows Aunt Cass without cleavage talking to Hiro. The post garnered over 76,800 upvotes in two days, and helped inspire a number of other memes featuring the image over the next few days.
For example, on February 28th, Redditor /u/Thelazytimetraveller uploaded a similar image macro to /r/DankMemes, garnering over 82,300 upvotes in a day (shown below, left). On that same day, Redditor /u/MrickyHR uploaded a meme featuring the image to /r/DankMemes, garnering over 22,000 upvotes in a comparable span of time (shown below, right).
As countless numbers of the memes continued to flood /r/DankMemes, users began posting memes referencing the oversaturation and joking about the horniness of the subreddit’s users, often using images of Cheems and the Go To Horny Jail meme (examples shown below, left and right).
On February 28th, Redditor /u/AnthropomorphicMango made a post to /r/ShittyMovieDetails reading, “In Big Hero Six, Aunt Cass’s blouse covers her cleavage. This is because the animators didn’t belong in horny jail” joking about the meme, garnering over 29,000 upvotes in 16 hours.
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Source: https://knowyourmeme.com/memes/busty-aunt-cass