Pun on "Class Act" , a sass act can be described as a person that lives life concerned with projecting a certain degree of sass apon everyone they speak to. Sass Acts usually come across as mean, but that's what they want you to think. THey really aren't, its just up to you to compliment and smile at their sassy personality.
Person 1: Hey!
Sass Act: You look like a raddish.
Person 1: Wtf, your an ass.
Person 2: Hey!
Sass Act: You look like a seahorse, neigh swish.
Person 2: Lmao, you are so sassy!
Sass Act: Bro, I'm Bringing Sassy Back
Person 2: So, were cool right?
Sass Act: Definitely Seabiscuit .