Definition of muckerism in English:

muckerism

Pronunciation /ˈmʌk(ə)rɪz(ə)m/

noun

slang US
  • Originally: unsportsmanlike conduct. Later generally: rowdy, coarse, or unsophisticated behaviour or attitudes. In quot. 1952: prejudice against such behaviour or attitudes.

Origin

Early 20th century; earliest use found in Princeton Alumni Weekly. From mucker + -ism.