The word "aunty" is a colloquial term used to refer to one's aunt, which is the sister of one's parent or the wife of one's uncle. It is a term of affection and can also be used more broadly to refer to close family friends or community members who are older and embody a nurturing role, similar to that of an aunt.
The word "aunty" comes from the word "aunt," which is derived from the Latin word "amita," meaning "father's sister," and the Old French word "ante," which also means "aunt." The diminutive form "aunty" is a more affectionate term that is often used in casual conversation.