Noun. A slut on steroids. A whore with a cape. A hybrid of the words slut and whore, generally used when either word on it's own is insufficiently strong on it's own to adequately describe a person's level of promiscuity. Slore can apply to both genders.
Example 1 - "my ex girlfriend is such a slore
Example 2 - john - "hey mike! What did you do this weekend?"
Mike - "dude! I slept with 6 different women!"
John - "oh my god Mike! You're such a slore!"