Guys, what does it mean when you poke a girls waist?

Anonymous
I had my shy guy friend doing this the other night When we hung out. We were heading home from a var with friends and I said I was so tired since I’ve been upp since 6am and he said ”yeah I noticed!” (Cause I sent him a text at that time about our plans which he saw later). And while saying that he poked my waist. I dont really get What it means
Guys, what does it mean when you poke a girls waist?
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