Answer:
Sam Adams Utopias. It is uncarbonated which makes it easier to chug.
Also, it got a stellar 100% from "Ratebeer" (though a paltry 98% on style)
Refer to my link below.
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UPDATE: Uh, no. Don't think many people are going to pay $120 for a bottle to play beer pong with. And good luck "chugging" a 27% abv beer. Best beer for Beer Pong is anything cheap - you're chugging it anyway, not appreciating it for it's taste.