What does it mean when a guy touches you on your stomach?

Anonymous
My best friend and I were coming home from a football game. He pulled over to the side of the road and got out to smoke by the car. I got out to join him to keep him company while he did. We talked about something I don't remember but then he goes "come on let's go" then takes his thumb and forefinger and I guess you can call it rubbed my stomach. I was just wondering what that could mean.
What does it mean when a guy touches you on your stomach?
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