One of Pinky's ancestors was known for being crazy.
The Vietnamese phrase "dien cai dau" translates to "crazy in the head". This became the Vietnam War-era slang "dinky dau" or "dinky-dow", meaning that someone is crazy. Over years the surname was corrupted into "Dinky Doo".http://tvtropes.org/pmwiki/pmwiki.php/WMG/PinkyDinkyDoo
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