UPDATE: Chris makes a good point in his comment. I was going to assert that it was "tippy cup" based on the fact that a search for "tippy cup" on Google resulted in 10,800 results, versus only 975 when searching for "flippy cup".
Search Google for "flip cup" and you'll be overwhelmed with 102,000 results. Not to mention that searching Wikipedia for "flippy cup" or "tippy cup" redirects you to the "flip cup" article.
I'm slightly embarrassed by all of this, considering that I participated in a flip cup tournament last summer to raise money for breast cancer research. Have you seen my "Will Drink for Boobs" t-shirt?
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