Why did these girls giggle after checking me?

Anonymous
I was sitting in the wall and listening music. I saw some girls are walking in the street. Anyway I was looking in the other direction. When they were passing in front of me two of them quickly look at me as I had quick eye contact with them. Then they passed me and they were giggling among themselves. I am not sure is it regarding me. But after few moment one of them turning back and peeking at me twice. I am wondering whether those girls found me attractive or funny guy?
Why did these girls giggle after checking me?
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