Confused as I am about how its spelled? There are a lot more, just try to Google "siomai". Apparently there are a number of ways to spell "siomai" as to how many variations it has. Siomai recipes varies from region to region and from country to country.
The term "siomai" or in the traditional Chinese 燒賣 or 烧卖 in simplified Chinese, literally means to cook and sell. So I guess you might want to double check on your Chinese character tattoo if the someone played a prank on you. :p