A person who pretend's to be a friend or colleague but hangs around you only to gather material to talk shit about you for his main friends or colleagues.
John: Ain't that guy you're lunching with from the marketing department?
Nick: Yeah, hes probably gathering 2face material, but anyway it's all good as far as he pay for his own food.
Someone who has done something one time before, defines itself as an expert on the topic.
John: Got laid?
Nick: Yeah.
John: Satisfaction granted?
Nick: Hell yeah, going like a pro like always!!
John: Yeha, like a grand master...
Nick: I'm no amateur.