Another mother that you bring with you to a party, event, or destination for when you want a break from your own motherly-duties.
Your best friend, who is also a mother, who watches out for your kid when you are otherwise indisposed.
I was chasing my five-year old daughter around the indoor waterpark but thankfully, my Wing Mom took over so I could hit the Tiki Bar.
As I was walking back from the port-o-potty at the park, I saw my Wing Mom pick my son up from the sandbox and remove him from the melee that had broken out among the three year olds.
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