A shameless
flirt is someone who will
flirt with anyone. They do not even necessarily need to be attracted to them. These types of
people flirt constantly, it is their default setting. When they are flirting with you, you know it. There is no question about it. Don't feel too special though, shameless flirts do it because it is fun and comes naturally to them, not because they particularly like the person.
Jordan: That girl was
flirting with me, I think she likes me.
Matt: Nah, she is such a shameless
flirt. Don't feel too special.