Anybody bored and would like to help me translate the word 'mim'? 22mo DS says it, normally in the morning pointing at the shelves but says no to everything I point to until I give up. He also says it during the day occasionally. I'm starting to think it's not an item, but an expression for a feeling? 
He has a twin sister who is not bothered by 'mim' in the slightest and just gets on with her business while he struggles to make me understand.
Help?!