Top Definition
When one dresses and acts like a baby, Having to be cared for in every way by a mommy, daddy, or both.
Adult Baby Joe has a mommy that feeds him and changes his soiled nappies
by Leshrec November 01, 2006

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Noun
Also referred to as AB
A person who acts like an infant or baby. Normally dresses up in a variety of baby like clothing like diapers, onesies, bibs, sleepers, and kid like shirts. Some adult babies find comfort and security in diapers and being cared by a mother or father. The age range for adult babies can vary from newborns to toddlers. Adult babies do not find sexual arousal out of diapers unlike diaper lovers (DL)
That Adult Baby isn't exactly the most normal. All he does is sit their like a read baby and have his mothers change him.
by Broken-Steel-Rocks June 29, 2009

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An Adult that acts like a baby e.g getting their nappy changed by someone else.
"Have you seen that adult baby next door? He's so weird!"
by Fernus123 October 14, 2015

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