Rhyming Expression of Surprise by the Boy Wonder

This page is the CodyCross answer for the clue below from Cartography, Group 2271, Puzzle 2 (Coastlines).

Question is: Rhyming Expression of Surprise by the Boy Wonder

and the answer is: HOLYMOLY

Word Meaning:

HOLY MOLY — Alternative spelling of holy moley.

Definitions from Wiktionary.