Guys, what does it mean when a guy indescreetly checks you out?

There's this guy who makes it very obvious that he checks me out. It's like whenever me make eye contact he looks down at my body and up again, and he's letting me know that he's checking me out. What does that mean?
I personally get a bit uncomfortable, but is it meant as a compliment?
Guys, what does it mean when a guy indescreetly checks you out?
Post Opinion