1. An oxymoron.
2. A genre of music describing independent bands that have become popular (aka selling out).
Jane: Oh her voice is so amazing! I like a lot of that indie pop stuff nowadays.
the mainstream of underground media.
the most popular music,writing,film ect. that is still not very popular.
---also, many upcoming bands, magazines ect. are considered inie pop until they make it into the Mainstream fame.