What is a kitty cat? This isn't a stpid question?!?

I know that it sounds like a really stupid question but I'm not talking about the kind that goes meow. At least I don't think I am. Okay, there was this woman at this playground for some boyscout derby race. Well, her sister or daughter called my 2 friends and I fat and ugly on this chalkboard, so we wrote back and said you're just jealous because you aren't as amazing and hott as us. Well, we walked back and her mom or sister said that we needed to grow up and she told her son or little brother not to play with us because we were kitty cats and one day he would understand what that meant. Well, right after she said it, she jumped on top of her boyfriend and started making out with him and smoking, right in the middle of the playground! And she said I need to grow up! All of the kids were watching them too!