What does it mean when two guys stare at you, look at each other and then look back at you?

Anonymous
This happens to me sometimes. Last time it happened was yesterday (hence this post). I was inside a clothing store and two guys around my age were waiting for their girlfriends (presumably). They both stared at me, looked at each other (their face was blank) and continued looking at me as I walked past. It was really strange to say the least.

Fyi, I'm not unattractive at all. I also don't have crazy coloured hair, any outrageous piercings or any other bold body modifications. I also wasn't wearing any super revealing clothes or anything.

Bonus question: I saw them talk to each other afterwards, were they maybe talking about me? Or am I being paranoid?
What does it mean when two guys stare at you, look at each other and then look back at you?
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