Amigoxic 

a•mee•gox•ik
adjective
Definition:
A description of a poisonous friend, an acquaintance
who is detrimental to the well-being of another.

Friend1: "I don't understand why you still hang out with that girl. She's not very nice to other people."
Friend 2: "She's not mean to me, and we get along just fine."
Friend1: "Well, I don't like how she treats you, especially when she acts like she's better. I think she's amigoxic."

Amigoxic by Barça August 31, 2016