That means skill saw or portable circular saw.
And you really need to have a lot of skill when you operate one of those things. Or you ought to. It’s hard to say whether this lady knew what she was doing when she was operating hers, though.
A court in southern Germany has convicted a 32-year-old woman of killing her boyfriend and severing his head with a circular saw. Prosecutors said she attacked her boyfriend while he was tied to a bed and blindfolded with blacked-out swim goggles, then decapitated him, probably after he died from wounds to the upper body.
My bet is she never saw sex like that before.