`Pissed off` means Qian was made very angry. You are an idiot.
http://en.m.wikipedia.org/wiki/Qian_Xuesen#section_2
He would remain on the Caltech faculty until his departure for China in 1955, becoming the Robert H. Goddard Professor of Jet Propulsion in 1949, and establishing a reputation as one of the leading rocket scientists in the United States.