Learn English – Super Duper -usage and nuance

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I'd like to know how to use the idiom: Super Duper.
It seems to be a slang which means great or marvelous. http://www.thefreedictionary.com/superduper

But, one of my colleagues sometimes says "I'm super duper busy today!" She is a non-native English speaker.
Is that usage also correct?

I also want to know the nuance of this idiom. Is it appropriate to use in a business setting?

Best Answer

Super duper is a rhyming reduplication of "super". The expression is informal and somewhat dated (usage attested from the '40s):

  • reduplication of super, (informal) extremely pleasing, impressive, etc: often used as an exclamation(First Known Use: 1940) M-W

Super-duper:

(old-fashioned, informal)

  • excellent - OLD
  • Your colleague is saying she is super (extremely/very) busy.

Super is also an adverb:.

  • Especially; extremely: a super accurate missile; was super careful.
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