The clip comes from Fosh Beary by creator Origami Almighty, a parody character made for MUGEN, the customisable 2D fighting game engine. Its name and lemon line riff on the combustible lemons rant delivered by Cave Johnson in Valve's Portal 2, where he demands life's lemons be turned into explosives. Fans ripped single words from character voice packs like this one for soundboards, and the lone lemon shout survived because it needs no context to be funny in edits, streams, and reaction videos.