Dolphin
When someone refers to someone as a dolphin, it is implying they are appear to be genuine to your face, while by nature they are malicious.
Girl 1 - “did you talk to Nicole last night?”
Girl 2 - “yea I did, she was really nice to me”
Girl 1 - “oh really I overheard her talking to jake saying how annoying you were”
Girl 2 - “eh she’s such a dolphin”
Girl 2 - “yea I did, she was really nice to me”
Girl 1 - “oh really I overheard her talking to jake saying how annoying you were”
Girl 2 - “eh she’s such a dolphin”