A baby conceived by sperm running down the crack of a woman's ass into her vagina.
(1) The term "Mudslide Baby" is used for people who are abnormal or unusual.
(2) Hey man, I think Steve is a "Mudslide Baby." He always spazes out after he sneezes.
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When a woman gives birth to a baby and poops at the same time the baby is referred to as a mudslide baby.
"My mom shit when I was born so I'm a mudslide baby. "