What does 'popularity 103' mean under a specific question on WikiAnswers?

The "Popularity: 103" under the specific question to which you are referring means that no fewer than 103 people have given the thumbs up to that specific question: they consider it an interesting/worthy question, etc. The higher the popularity rating of a question, the higher up it appears in the list of questions of that specific category, and the greater the chance it has of being answered.