Why did he lick me?

Hey everyone. I've been friends with this guy for a while now but have been hanging out with him at his house more often recently. We were joking and talking with each other and he said something which led me to playfully want to hit him but he blocked me saying no I won't let you and we began play fighting until he said he will lick me if I don't stop and I said I think you're trying to scare me and he then does it for a split second on my hand to get me to stop wrestling him. What is that about? Why would he say that and do that?

Why did he lick me?
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