Top Definition
A phrase to describe an adult who remains trapped in a childish worldview and is therefore unwilling to deal with reality, instead reverting to the benign idealism of her early days playing "My Little Pony" and brushing her doll's hair.
She wanted it written into the divorce agreement that their five-year-old has to spend every birthday until he's eighteen with her, since they happen to have the same birthday...she's so...my pretty pony.

She was far too "my pretty pony" to deal with the IRS's lien notice. "How can I possibly pay my $2000 tax debt," she reasoned as she burned the letter, "when there are Gucci handbags to buy?"
by urbanangel225 July 12, 2011

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