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comic strip characters Augustus Mutt and Jim Jeffries, in U.S. cartoonist Henry Conway ("Bud") Fisher's strip, which debuted in 1907. Used allusively from 1917 in reference to "a pair of stupid men, affable losers," or to one tall (Mutt) and one short (Jeff).
A mismatched pair of people
[1917+; fr the names of two characters, one tall and the other short, in a popular cartoon series by H C Fisher, American cartoonist]