it is used to call someone you really love, care for, have feeling for. They are usually very close to you. The one for whom you can sacrificeyour life.
When a witch captures tons of cute little kids and incinerates them into a pie.
Mother: I love you!!! You better not become a cutiepie!!
Son: Whats a cutiepie?
Mother: A pie made of cute little kids... They taste extroadinarily good!