Remember playing the game Hot-Warm-Cold as a child? When looking for a hidden object, the person who knew the location would say "You're getting warmer" if you were approaching the object, or "You're on fire!" or even "You're burning up" when very close to the object. Conversely, they would inform you that "You're getting colder" if you weren't headed in the right direction or "You're freezing" if you were very far away from the object in question.
The equivalent expressions in Italian are: acqua, acquetta, fuochino, fuocherello, and fuoco. Just don't forget where you hid the object!