Haha Chester is way too cool.
Funnily enough, my cat walks around with his tongue poking out.
Is he a older cat? I have a cat that does the same but she does it after she is finished cleaning herself. My dog doesn't actually walk around with her tongue hanging out, she just poked it out as I was taking the picture. Though it wouldn't surprise me if one day I did walk out there and her tongue was poking out like that.