1. A person who poses as a member of a group but are doing so just to mess with their heads for the fun of it.
2. A person who poses as a member of a group in order to prey on them, argue, preach, or cause discord.
That guy I thought was someone in my class ended up being a 45 year old creep from another state. He mede me think all my friends were gossiping behind my back. He was an infil-traitor!
I found out that the guy who joined our pagan group was really a Christian fundamentalist arguing for Jesus's love. Right like I need to hear that. What an infil-traitor