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An extremely hot girl who makes you go Ga-Ga.
1950's slang.
see also: "Uber Hot Babe" and/or "Hot Girl".
Check out the one on the left, what a Wacky Doo. *wolf whistle*
Wacky Doo by Add Bacon September 8, 2012

whack a doo 

Strange; Displaying odd behavior or bad judgement as a result of drug usage.
I was trying to talk sense to John, but he was whack a doo.
whack a doo by getzalot September 1, 2009