Guys: When men look at a woman from head to toe, like a quick glance What does that means?

Anonymous
When men look at a woman from head to toe, like a quick glance but keep looking straight like she ain't even there, does it means the guy interested in her or not. I just want to know from the fellas, because I have seen this happens to some women and my friend thinks they are interested, but I think they are not and just trying to see what she really look like from head to toe, before they decide to just move right along. Because I have seen the stares that they keep looking back at the woman and I think they are interested or find the girl attractive to them, when they look back.
Guys: When men look at a woman from head to toe, like a quick glance What does that means?
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