Pilot-induced turbulence? ...do I even want to know what that means?!
Nice clip though! 
One of the two pilots flew the aircraft using quick, abrupt control inputs which looked like the plane was going through turbulence.
Pilot-induced turbulence IOW means: Pilot controlled the airplane with sharp control movements and the control pressures used created turbulance due to those inputs.
Awesome clip! Haven't heard something like this in a while. ...controller also sounds like he's on the ball.
Jason
P.S. Pilot-induced turbulence in the case it was used in this clip was kind of a joke as well. The ATCT thought the plane was going through some sort of turbulance, but the pilot admitted it was basically their fault. <g>