The phrase comes from German crypto discussion around Blocktrainer, a well known voice in German speaking Bitcoin education, where alles Quatsch is a colloquial way to call something complete nonsense. Clipped from longer commentary, the short line circulated as a standalone reaction on soundboards and in edits, detached from the original argument. Its appeal is the contrast between a technical topic and a very everyday dismissal. German speaking creators keep reusing it for shitcoin launches, price calls and trading claims, and non German audiences use it as an emphatic meme reaction.