Basically means no, or unlikely to happen.

A mom and dad maybe (aka parental maybe) can be used by anyone for any reason, but is most often used by parents as an answer to a child's question.
EX Mom and Dad Maybe:

Child: Hey, Mom, I don't have any homework, can I spend the night at Jimmy's house?

Mom: Maybe, but it's a school night.
by Dtone157 January 7, 2017
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