What's a flirt finder?

So, I had a sucky day and this guy was texting me, saying my days wouldn't be sucky if I saw his y face everyday. Well, anyways, he kept adding more words to express his "iness", and I told him that there wouldn't be enough words to explain his iness to satisfy him. He then said "Nope, but the fact that I know that you think that does.". Anyways I asked what made him think that and he said he could see it by the way I looked at him, I asked him if he was a mind reader, and he said no, I'm a flirt finder. What the heck is a flirt finder?