Ambiguity:
The multiple meanings, either intentional or unintentional, of a word, phrase, sentence, or passage. 

Example:
  "Heaven's Just a Sin Away" -The Kendalls


Explanation:
The title of the song "Heaven's Just a Sin Away" is ambiguous, in a religious way. Committing a sin keeps us out of heaven, but it could also mean that committing a sin will bring heaven (pleasure). This is found out through the lyrics of the song. This is used because you see that the title/song has a double meaning, which is what the writer wanted.