palooka

noun Slang.

1. an athlete, especially a boxer, lacking in ability, experience, or competitive spirit.
2. a stupid, clumsy person.

noun

1. US slang a stupid or clumsy boxer or other person

n.“mediocre prizefighter,” 1926, of unknown origin, credited to U.S. sportswriter and “Variety” staffer Jack Conway (d.1928). Non-boxing sense of “average person” is from Joe Palooka, hero of Ham Fisher’s comic strip.