I know that is unusual, but keep in mind nobody downloads an app because it is exactly the same as every other application.
Anything silly and whimsical.
If you were to look at a teenagers phone and ask "what does this word mean, and this word, and this word." That is our audience. Example: "OMG LOL FML" (clearly you know those words, but your parents may not)
Apple actually rejected our App the first time because our marketing copy was too ridiculous. This is the more reasonable version.