Originally Posted by Wikipedia

Screamo is a subgenre of hardcore punk which predominantly evolved from emo, among other genres, in the early 1990s. The term "screamo" was initially applied to a more aggressive offshoot of emo that developed in San Diego in 1991, which used short songs that grafted "spastic intensity to willfully experimental dissonance and dynamics."[2] The genre experienced a popularity boost in the late 1990s and early 2000s, and by mid-2000s the over-saturation of the scene encouraged bands to incorporate more experimental elements. Due to the popularity and evolution of the style to a point of being unrecognizable, the term "skramz" is sometimes used to describe bands from the first wave of screamo.