Sething - colloquially also known as Seffing (or just sff-ing) is a verb that describes the action of swiftly and neatly snatching something away from a surface (or a person). The action is typically performed at such velocity that the wind makes a sound from how fast your arm is traversing through the time-space continuum.
Person 1: Lemme seth that shit, SFF *snatches vape from desk and takes a fat rip*
Person 2: Holy fuck dude he seffed that shit
Person 3: Yeah dude. He's a master of Sething