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Tap water consumed on a night out as a substitute for alcohol, usually drunk on it's own but sometimes drunk alongside alcoholic beverages.
Guy A: Sup dude, what you drinking there?
Guy B: It's a happy tappy dude.

Guy A: Man I'm thirsty, but I don't want to get drunk.

Guy B: Hey try this, it's a happy tappy.
Guy A: Whoa, this is super refreshing!
Guy B: I know right!
by UnclePhilip July 06, 2012
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