
"What do you do at Wal Mart?"
"I'm a night stalker."
At this point in the film
Buzzard, our "hero" Marty has been living off of his skills as a scam artist for a few
days, on the run from trouble with a previous con. He's been caught by the manager of a check cashing place, and is being held in the back office until the cops arrive. During some chit chat, he comes up with several stories, one of them about a job at Wal Mart. In passing, it's not all that important, as he just wants out of the building. But, when asked the specifics of his job, he pronounces stocker as "stalker".
This takes the manager back a bit, who responds with a what and a smirk. To us, it was only a matter of time.