Someone who is VERY social and easygoing; can be either a male or a female. Usually these people don’t belong to a particular group, but rather jump from one group to another. They are somewhat accepted in all of them, but don’t really have any deep friendship connections in any of them.

I couldn’t care less (but one must keep up appearances, right?)

It's a word/title that is usually used to describe someone that is popular. Often times those people are friendly or pretty, but it is not always the case. It is not always used to describe popularity alone, it could also be describing someone who is friendly to strangers. Typically a word used to describe females.

Someone who befriends someone but then runs off as soon as someone cooler comes along.

A nicer way to say 'playa/player'.
A person who flirts with many people, can easily fit into any environment and does not look for long-term relationships.

It's Sugar Coated For Being A Hoe.
A Nice Way To Call A Hoe.

someone who flirts alot and is somewhat easy, could also be known as a slut, normally used by elders that want to be nice in the way they talk about that girl that you brought home last night, or the one that there glad your just friends with