When you
stare at someone, or someone stares or spies on you repeatedly, either checking you out or in a disapproving
way.
It can be used to describe the
culprit and also what they are doing.
katy: I think we're being cocknosed.
Anna: Yeah i know, it's that cocknose over there, could he be any more cocknosey!
Katy: I know, cocknosers really get my goat.