The 'Millennial Whoop' is a term coined by musician Patrick Metzger in 2016 to describe a specific alternating melodic interval between the fifth and third notes of a major scale, typically sung as 'oh-oh-oh-oh.' Dominating the airwaves between 2008 and 2016, it appeared in massive hits by artists like Katy Perry, Owl City, and The Lumineers. In internet culture, the meme is used to satirize the repetitive nature of mainstream pop music and the psychological tricks used to make songs 'catchy' to the masses. It serves as a symbol of late-millennial pop culture homogeneity and is often paired with imagery of listeners being overwhelmed by the unavoidable, repetitive hooks of the era.