The phrase que onda is everyday Mexican slang for what is up, and this recording is tagged to Daniel Carreón and his beginner lesson on frequency tables. Carreón built a huge Spanish speaking audience on YouTube by explaining maths in a clear, friendly style, and his greetings became familiar to students learning at home. Clips were later cut from lessons, written in leetspeak as QU3 0ND4, and shared as standalone sounds for chats and edits, where the greeting now works apart from the original lesson.