super-duper

super-duper

[soo-per-doo-per]
adjective Informal.
extremely good, powerful, large, etc.; very super; marvelous or colossal.

Origin:
1935–40; rhyming compound with invented second element

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World English Dictionary
super-duper (ˈsuːpəˈduːpə)
 
adj
informal extremely pleasing, impressive, etc: often used as an exclamation

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