1. A spelling of
Britney Spears used by people how are either too "grown up" to admit that they actually like her music and in secret listen to it
all the time, or
2. used by people who don't want to be
associated with her or her so called "music", but still listen to it in secret, or
3. used by people who can't spell but still listen to her music in secret and dream of her all day long.