Top Definition
Scoring on three sisters in the same family. From South Boston, where you typically have four to six sisters to choose from. And if you manage to score on all three of them on the same night, it's called a "natural."
Ryan: "Was that Melissa O'Halloran I saw you with last night?"

Brendan: "Yeah ... score!!!"

Ryan: "Didn't you bang her sister Jamie in high school?"

Brendan: "Yeah, and I nailed Lauren O'Halloran at Nantasket Beach last summer."

Ryan: (high fives Brendan) "A southie hat trick!!!"
by El Perrito Blanco July 11, 2012

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