I have scoured out dictionaries searching for the word wiener without success. As you can notice I am not a native speaker. I usually see the this phrase as a demeaning joke on animations when some character is lured to say one's name when actually it turns out as something stupid like "I'm a wiener" or "I. C. Wiener".
Can someone say where is the joke on it? Because it sounds to me like "winner", what is not a demeaning word, reather it comes as a comendation.