Just curious, all responses welcome.  
I know the term can be widely interpreted
Just for fun

I would say anything that is not "vanilla", border line taboo. I would say snowballing and pegging would fall into kink.

END OF MESSAGE

They say it's erotic when you use a feather.
It's kinky when you use the whole chicken.

Sorry, old joke.

But then again so am I.  

Spanking, tickling, restraint, blindfolds, flogging, some aspects of role play like maledom/femdom stuff.  

I once had a lady make me wear leopard striped speedos, tied me to the bed and orally please her until she was satisfied.  And that was the just warm up act.

Now she was kinky.

It's when a woman wears a strap on and takes a trip to Greece with a man.

Love the leopard Speedos part... Actually the whole thing sounds fun!

Hmm. I must confess a guy fucking me in silky boxers or panties has always been a huge turn on.  The extreme bi in me loves for a guy to dress up. But that's just fun for something different.  
It's only kinky the first time I always say.  

When a guys ask, "what do i do to earn the "kinky" in my name?" The response is what don't I do. If it turns the guy on it turns me on. I don't go balls to wall in the first visit and scare a guy,  unless they have a specific request or maybe second visit...the kink comes out...

what is balls to the wall?? Inquiry minds wants to know

When I see the term "kink" I usually assume it's a reference to BDSM, even though I know the world of kink is much broader than that.

"a sharp twist or curve in something that is otherwise straight."  That opens the door to a lot of things......hmmmmm.

END OF MESSAGE

Very good. 😂

Yes that's where my mind usually goes too. But the as I've learned even something "normal" can become a kink if you let it... Ie. Kissing fetish