or vise verse if someone is "giving you the eyes" what does that even mean?
context please? it can stand for looking at someone with anger,or lust-so it's a wide spectrum.
Looking at them angry. Usually eyelids are pushed more closely together.
It can mean multiple things depending on the context. It could mean someone is checking you out because they like your appearance or it could mean they are glaring at you with a negative intent.