Line cook and Server flirting?

I work in a restaurant and there's this one line cook that I love working with. We joke around all the time, we laugh at eachother and smile at eachother a lot. When we start to clean up the kitchen close to closing time he'll start throwing food at me through the line, and I'll throw some food back at him. He's now done the taser, (poking sides thing) to me. Is he just messing around like a friend or actually flirting?
Line cook and Server flirting?
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