What does it mean when a guy tickles your wrist?

Anonymous
ok, so this guy in my English class asked me if I was working with anyone for a paper we had to write. I assumed he just wanted to be my partner because I am good at English. Well I said nobody, because my usual partner wasn't there. He asked me if I wanted to work with him and I said sure. Well then my normal partner comes into the room. She said hey, aren't we working together. So I asked if we could work in a pair of 3. The girl did not want to. So long story short, the boy handed me my paper back, and he was like "nice working with you." then he put his hand out for a handshake. So I went to shake his hand, and he started tickling my wrist with his middle finger. When I tried to let go because it was awkward, he kept doing it. Then eventually he let go of my hand, and I was just like I don't want to know.

Well later I was telling my friend this story, and another friend over heard and he said its just something guys do. lol Well what does it mean?
What does it mean when a guy tickles your wrist?
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