An overly promiscuous man or woman. Unfortunately, this term is used more often for women than men, although men sleep around way more than most women.
Man: That girl is such a whore! She slept with almost as many people as me!
Man 2: Aren't you glad we're men? We can be as big of sluts as we want! And spread more HPV!
Someone who dresses where their body is overly exposed in a way that is not appropriot for their age. A whore is also someone who has given themselves up to someone who they werent in a real relationship.