What does it mean?
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Here's the answer, according to the Urban Dictionary:
The one-up rivalry that moms play making their child seem better, smarter, and/ or more advanced than yours. May involve two or more moms and any number of children, even full-grown.
She engaged me in mompetition insisting her son walked at 6 months and implying my son was slow for his age.
Horizon: Scott Westerfeld
20 hours ago