I have heard the term used by CBI transport crewmen to describe those men who had completed more than 100 trips over the hump. I am reasonably certain it was a verbal reference among the Hump crews and not a structured goal.
Tony Strotman, MSgt (ret.), USAF
Son of T/Sgt Francis E. Strotman, Engineer-Gunner,
491st Bm Sq / 341st Bm Gp (M), Yangkai, China
"USAAF in CBI Tribute" http://www.usaaf-in-cbi.com