Actually, if I wanted to tell someone they were making me hot, I would absolutely never use that phrase. I'm not sure what I would use--but it wouldn't be that.

Mostly I learned useful phrases like "Vale," which I still try to use in compeltely inappropriate contexts here, and "Fuerte," which has no English equivalent I can think up.

Oh, and "?Tienes fuego?," which means, "Do you have a light?" Not that I USED it, but I definitely got ASKED it.