The 'Fantastic Four Gang Sign' meme, often featuring the phrase 'Ain't That Fantastic FN,' depicts Mister Fantastic (Reed Richards) contorting his fingers into a gesture resembling a gang sign. This trend belongs to the broader category of 'hood irony' memes, where wholesome or intellectual characters are recontextualized with urban slang and street culture aesthetics. The image usually circulates as a reaction to something impressive or unexpected, blending the stretchy powers of the Marvel character with a humorous, street-savvy persona. It gained significant traction on platforms like Twitter and TikTok, where users appreciate the absurdity of a genius scientist adopting a tough-guy attitude.