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A baby borne from multiple male band members sleeping with either a female band member or a female roadie, Usually the father is unknown and will remain so and the baby will be raised by the whole band.
Woman: "I slept with Jim, Shady and Rick and I have no clue who the father is."

Man: "Sounds like you're having a band baby."
by TheMsource June 17, 2012
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A baby produced by two members of marching band. Usually on a bus going to or coming home from a compition.
They were defintely making Band Babies in the back of the bus.
by Rebekah November 30, 2004
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A band you take pride in seeing mature and grow, because you liked them before they were widely known or popular.
Person #1: "Mumford and Sons are the most blogged about band in the country, is it sad that means a lot to me?"

Person #2: "No way, they're your band baby."
by Jozzle October 11, 2009
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