extremely pleasing, impressive, etc: often used as an exclamation
WordReference Random House Unabridged Dictionary of American English © 2025
su•per-du•per
(so̅o̅′pər do̅o̅′pər),USA pronunciation adj. [Informal.]
- extremely good, powerful, large, etc.;
very super;
marvelous or colossal.
- rhyming compound with invented second element 1935–40
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