- Used to describe the actions of someone who should be acting more maturely.
John, you should know that answer. The answer you gave was complete muppetry.
Dictionary of american slang with examples. .
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muppetry — noun The behaviour of a muppet; foolish incompetence … Wiktionary
Muppet (slang) — [ Hibernian Direct Limited in Ireland, is an example of the usage of the term as slang.] The term Muppet (capitalized), coined in 1954 by Jim Henson for his puppet act, has unofficially become a slang term (lowercase) with different meanings in… … Wikipedia