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When a person's conversation/comments/Facebook status is followed up with something about their friend's children, when it has nothing to do with the conversation. The "Mommy" just wants to steal the conversation to speak about their children. As defined on stfuparents.tumblr.com.
A classic MommyJacking
"Did I tell you where I went to dinner?"
"Oh that reminds me, little Johnny did the cutest thing at Red Robin last night!! He ran screaming around with a balloon for an hour!"
by Sloan3 January 13, 2010