The act of going to a night club or busy bar and scoping out your prey in the shadows. Then, when they least expect it -or when they are at their highest point of intoxication-, you swoop in and get really fashion friendly. Usually the natural habitat of a lurker is around the dancefloor.
Pitman: What is Bean doing over there in the shadows?
Hunter: Looks like he is lurking again.
Ham: He is scoping out prey to be his next victim...lurking is an artform.