It is I who nuts to that refers to a popular reaction image macro meme, depicting Bowser aka. King Koopa from the Super Mario series, along with a cropped dialogue box, reading the titular sentence.
Although the exact origin of the meme is not known, the earliest post, featuring the meme was posted on Amino by user Not Osito on January 20th, 2018.
The popularity of the meme started increasing in March, 2018, as it would start appearing on sites like Tumblr and Reddit.
The “It is I who nuts to that” meme reached its peak in January, 2019, as YouTube parodies, Reddit, DeviantArt, Imgur as well as 9GAG and iFunny posts would feature it.
In September, 2021, the reaction image experienced a slight revival, reappearing in posts on numerous aforementioned sites.