Where you are happy and dance because you have shampoo on your head. One needs to be exceedingly happy about having shampoo on one's head to truly perform a successful happy-shampoo-dance.
"I did the happy shampoo dance."
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when you dance around with shampoo on your head and your all happy and shit.
Let us dance the happy-shampoo-dance!
Indeed, we shall!
(Crazy Indian music begins playing)
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