gee whiz
exclamation/ˌdʒiː ˈwɪz/
/ˌdʒiː ˈwɪz/
(especially North American English, old-fashioned)- gee (= a word that some people use to show that they are surprised, impressed or annoyed)
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gee whiz
Definition of gee whiz exclamation from the Oxford Advanced Learner's Dictionary