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an acronym for "Back Yard League", an amatuer sports league commonly formed by high school boy who cosider themselves "a band of brothers". Activities range from hockey to partying.
Guy #1: "Hey bro. You going to play hockey later?"

Guy #2: "Nah man. Sage didn't invite me. He says I'm not in the BYL."

Guy#1: "Why am I talking to you again?"

Guy #2: "I was at the party at Ernies."
by 1bigolnut March 24, 2010
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