sass is a style of hardcore punk for gay horny art students. I wouldn't really call this a genre since it ranges from something accessible like indie dance punk to mathcore and grindcore, it has some common tropes though, like: the use of synths, homoerotic shouts which are border-line moaning, the disco hi hat beat and post-punk influenced guitar playing.
http://www.self-titledmag.com/wp-content/uploads/2014/05/Blood_Brothers_-_B_-_Stierch.jpeg
if you wanna get into sass, check out these lists!!
https://rateyourmusic.com/list/silhouettesaloon/sasscore-101/