Expression of surprise or exasperation. Similar to "Goodness gracious." Never a popular saying, but was used sparsely in the 1950's and 1960's. Probably a forerunner of great googly moogly.
"Great Googa Mooga, can't you hear me talkin' to ya?"
The Temptations - 'Ball of Confusion'
by tantiboh August 23, 2005
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