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To sit on the toilet backwards and shit into the toilet.
Richard loves to eat breakfast while performing the Portuguese Flipshit.

Jenny: Did you hear what happened to Brie?
Lilly: Yeah she queefed in health class, right?
Jenny: No the other thing.
Lilly: Oh, no what?

Jenny: She clogged the toilet while performing a Portuguese Flipshit.
by Brie B September 16, 2011
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