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If a man is married with a family, and has a child with another woman while still married. The bastard child is the the "side kid".
Autumn Jackson would be Bill Cosby's "side kid".
by Matt, Jeff, Chad September 22, 2007
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2
Referring to children you've had outside your marriage with other women.
Got any side kids? Nah just the one with my wife
by Toolz September 12, 2007
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