Sentence:  Watching, surveying. Scrutinizing. We walked further south, past the hubcap sellers and the hot dog stands. I told her that I learned a long time ago that if you knew what was going on around you, what faces were where, then no one would bother you. Only two kinds of people <WSD>eyefuck</WSD> other people, psychos and policemen. 
Meaning of the word marked with <WSD> tags:  To stare at, especially at something or someone with which one has a hostile relationship.