I got this new anime plot refers to a viral copypasta online, associated with people referring anime series to each other, based on their plot.
The word plot, however, doesn’t refer to the twists and turns of a narrative, rather it is used as a codeword for drawn female mammaries, which are referred to later on in the posts with various nonsensical, onomatopoetic euphemisms, which are created so that they convey the ridiculous sizes they are meant to describe.
“I got this new anime plot” later spawn humorous animations, revolving around the same theme as the copypastas.
The first time “I got this new anime plot” emerged on Tumblr was on February 9th, 2016, when saturdaynightbigcocksalaryman made a post about the new anime he found.
When explaining the plot, his description is swayed toward naming the big breasts with various made up words, that aim to express the massive sizes.
The original post was continued by other users, while also receiving a lot of notes over the years.
In July, 2016, Tumblr user jacobtheloofa posted his voice acting of the original description, gaining a lot of traction.
Almost a year later, on June 6th, 2017, he uploaded the voice acting to YouTube.
This upload had spawned a trend among animators, attempting to envision the story of “I got this new anime plot”.