Sweet-potato-
sauce is an exclamation similar to '
cool', 'awesome' and 'sweet'. It is used mainly because of its superior syllable construction. It often seems insufficient to simply say 'sweet!' when you find something pleasing. However, 'Sweet-potato-
sauce' has, at 5, the perfect number of syllables. You might laugh, but it is the best way of expressing you contentment.
Person1: Hey, were you able to finish the summer reading?
Person2: Yeah, I finished the whole
thing!
Person1: Sweet-
potato-
sauce!