An expression describing someone who is terribly happy with the circumstance they are in (but perhaps a little overloaded with choices, not quite sure what to do first because it all looks so good). The assumption is that children will go wild in a candy store, grabbing handfuls of all their different favorites, given the chance. This phrase is well-known enough to sound cliche to many English speakers.

Sources: being a native speaker of American English
http://www.clichesite.com/content.asp?which=tip+2442
http://www.hkedcity.net/article/xmas2002-e/phrases/
http://www.talkiteasy.net/american_english.html

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