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."
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bye your life
it basically means kill yourself
kim: did you just eat my last cupcake
lana: yes. sorry
kim: byl. or go buy me another box
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Debra: OMG, Last night I swear I saw Oprah driving downtown!
Candice: BYL, Debra.