title_body: Official resource on simlish language
upvoted_answer: According to the Font of All Knowledge, Simlish 
  
  
    worked best as a "language" made up of gibberish words that could not
    be translated, so that the dialogue's meanings would be left open to
    the imagination of the player.
  
  
  and that William Wright, the Sims creator, intended it to be that way.
  
  Here's a good Youtubeumentary on the topic. The voice actors, the audio director, they aver that it's gibberish. Meaning or emotion without form: while some words and phrases may have acquired "meanings", it doesn't seem like they've actually acquired "translations". 
  
  For example, if an English speaker says sulsul means "hello" while a French speaker says it means "bon jour", that doesn't mean hello = good day. All three are greetings, and I think that's rather Wright's point: sulsul has acquired universal meaning without actually acquiring a specific translation.