He's Already Talking About A 3Rd Term.
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No best answer has yet been selected by Shandyjewell. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.It's from the days when sand-boys (or men) drove their donkeys through the streets hawking bags of sand, usually obtained from beaches. The sand was used by people for their gardens, by builders and by publicans for sanding their floors.
The happiness of sand-boys was due to their habit of indulging in liquor with their takings!
The phrase first appeared in print - in exactly the 'happy' form we're all familiar with - in a publication called 'Life in London' in 1821. That referred to someone who "appeared to be as happy as a sand-boy who had unexpectedly met with good luck in disposing of his hampers" of sand. In other words, it was the mere fact of getting rid of the wretched stuff that pleased them so much. (Of course, they may well have gone straight to the pub thereafter, C!)
When this question was asked before, another answerer said sandboys were employed in pubs to sweep up the sand scattered on the floor. When they found a dropped coin therein, they were delighted...so there's another conceivable pub-related explanation. I'm perfectly sure there's an element of truth in all of them and all I'm claiming for 'mine' is that it seems to have been the original. Cheers, Ma'am.