A term of endearment. Usually referring to a male family member or close friend. Could also be used in the context to show love for someone. Lastly, it may refer to the beautiful/innocent nature of something or someone.
Could also be altered to specifically illustrate a certain person (i.e. Babynumce, Mothanumce, Sistanumce, etc.)
As in Eddie Murphy's movie "The Golden Child" he welcomed his enemy sarcastically in the airport saying, "Well it's my dear sweet brothanumce!"