A trust whore is someone who gives out their trust and kindness for free. it's kind of like a regular whore but you don't see it as an easy first time, you see it as a person you can easily manipulate. so, be careful with who you befriend. you could end up a trust whore.
shortened version is "trore".
Person 1: I can't believe you're dating Person 3 for the fifth time, you know they manipulated you and stabbed you in the back for Person 4!
Person 2: I know they did, but I know what I'm doing. so back off. I don't care if they manipulate me for person 4, I trust them!
person 2 is a trust whore. I know who you are. but I'm not letting you know.