IC MAC? IOMAO? IOMAC?

I remember when the “seller” (a dear dear friend) told me about this strange cart. He gave me a picture and…well. We have no clue. Looks like a SNES cart…but it’s not. Maybe some kind of DEV item?
A joke made by someone (not the seller)?

I presume you know what a stereogram is. You cross your eyes and you can see a picture or some text, like the following:

…well, check the label of this WTH cart.