The image is from Sonichu, a comic by Christine Weston Chandler, more commonly known as Chris Chan. The titular character Sonichu is an amalgam of Sonic the Hedgehog and Pikachu from Pokemon. Chris Chan was the subject of a lot of internet drama for a few years.
The commented image is a screenshot of someone asking if the icon the character in the comic wears is Sonic or Pikachu. The answer is both, and the commenter is saying that the user is morally innocent because they have never heard of Sonichu.
i honest to god have shivers running across my skin and i’m laughing so nervously what the fuck? do people not know what sonichu is anymore? please. please, younglings, learn your history
Motherfucking Cowboy Meowchow 