Great googly moogly

Meaning

A nonsensical, humorous exclamation used to express extreme surprise or befuddlement. It is intentionally silly and hard to say with a straight face.

Silly, nonsensical

Used in a sentence

• Great googly moogly, did you see how fast that guy ran?
• I dropped my sandwich on the floor and all I could say was great googly moogly.
• Great googly moogly, that is a lot of homework.