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Related to gee whiz: gee whizz
1. interjection An exclamation of any strong emotion, such as surprise, dismay, enthusiasm, exasperation, etc. Aw, gee whiz, Mom! Can't I stay out and play for one more hour? Gee whiz guys, wasn't that show great?
2. adjective Especially enthusiastic or impressed; youthfully or naïvely optimistic or exuberant. Often hyphenated. The film is sure to provoke some gee-whiz reactions from even the most cynical of spectators. A lot of people come into politics with some gee-whiz notions of changing the world.
3. adjective Showily or gaudily impressive; amazing or astounding. Often hyphenated. The film boasts a lot of gee-whiz effects but doesn't offer much else in the way of plot or character development.
An expression of surprise, dismay, or enthusiasm. For example, Gee whiz, Dad, I thought you'd let me borrow the car, or Gee whiz, they finally won the Series! This term is thought to be a euphemism for "Jesus Christ." [Slang; 1870s]