1. A term of endearment for a child or young person; a cute or affectionate nickname.
Usage: informal; chiefly British
2. A term of endearment used between romantic partners.
Usage: informal; dated

Examples

• Come here, popsie, and give me a hug.
• The grandmother called her granddaughter popsie whenever she visited.
• He affectionately called his wife popsie throughout their marriage.
• Popsie, would you like some biscuits and tea?
• The nanny used popsie as a term of endearment for all the children in her care.