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1.
When a male cums, and it lands in the belly button of the lady,or fellow dude for all you man on man lovers ;) The sperm are the "baby" of this phrase, and the belly button is the "pool"
---Look honey! I made a baby pool!!!!!

---Ugh, get me a towell, need to get rid of the baby pool...
by Mike Moustakas September 05, 2013