What is a kiss?

Uhm..so ok this a pretty random entry, but the thing is that Ive been asking myself this question for days now.

What is a kiss?

I have a had a ton of experiences with more than 10 different people (boys and girls), but even if some feel good and some feel like you are wasting your time, i have never kissed with love and most of them i have given em drunk.

But my real point is that to this day, a kiss means nothing to me. Absolutely nothing.
Is this because ive had experienced so much without meaning any of them that now I cant find meaning to it??

So can anyone tell me what is a kiss?...or at least for yourself?