Sass lord is the highest rank of sass one can achieve. They are the Bruce Lee of verbal scuffle, master of their craft. They thrive in chaotic skirmishes as they are the best at finding flaws in whatever you're saying, and if there's none, create ones. Picking a fight with a sass lord means you are fighting a losing battle, the more witnesses there are the more this statement stand since sass lords are professionals at getting everyone on their side against you.
Kid 1: *Starts making fun of random peoples*
Kid 2: Hey you should stop that before you catch the sass lord attention.
Sass Lord: *Cracks neck while making a self sufficient smile*
Kid 2: Oh shit mate you're done for. I'm out of here.