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1.
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".
автор: Matt, Jeff, Chad 22 сентября 2007
 
2.
Referring to children you've had outside your marriage with other women.
Got any side kids? Nah just the one with my wife
автор: Toolz 12 сентября 2007