goon /ɡuːn/ BrE AmE noun [countable] informal
[ Date: 1800-1900 ; Origin: Partly from gooney 'stupid person' (16-19 centuries) ; partly from Alice the Goon , character invented by the U.S. cartoonist E. C. Segar ]
1 . especially British English a silly or stupid person
2 . especially American English a violent criminal who is paid to frighten or attack people