is mimi a creole word and if so what is it's meaning?

mimi is what Haitians call a cat, kitten, or pussycat.

When Americans are trying to get a cat's  attention, they say, "Here, kitty kitty!"
When Haitians are trying to get a cat's attention, they'd say, "Mimi! Mimi!..."

Remember that the generic Haitian Creole term for cat is chat