Ok, my might take a while to break down for pronunciation, but here goes:
Start with the word muffin. It looks just like the word 'muffin' but don't be fooled, it isn't. To pronounce muffin you need to make a cow-like noise at the beginning (Moo for those of you who don't know). As you start that cow noise, you have to say uh, like you've lost your place and are trying to stall for time.
Then, begin to say 'fuck', but like you didn't mean to say it and are trying to stop yourself at the f. This will create the drawn out double-eff sound.
Finally, and this is the easiest part, add the word 'inn' at the end. If you are having trouble doing this, say 'end' and stop the word before you get to the dee sound. It will have the same effect.
As for the second part, 'cakes', I regret to inform you that mortals will be unable to pronounce it as the word transcends your ability to understand the basics of my language. I would advise you to just make something up that sounds good to you, and then never to share it with anyone else to avoid the embarrassment that would follow your obvious mispronunciation.