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1.
Much like a bachelorette party is meant to celebrate a bride-to-be's last night of freedom, a momchelorette party is meant to be a last hurrah for the mom-to-be before the arrival of the baby. Usually thrown by the godmother or other close friend.
Example: "I'm pretty sure Amanda hooked up with that guy we met at Sandy's Momchelorette Party."

Example 2: "She may be 9 months pregnant, but that momchelorette sure can dance!"
by sandywitz September 23, 2011
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