Meaning of the word "a growing youth has a wolf in his belly" in English

What does "a growing youth has a wolf in his belly" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a growing youth has a wolf in his belly

US /ə ˈɡroʊ.ɪŋ juːθ hæz ə wʊlf ɪn hɪz ˈbel.i/
UK /ə ˈɡrəʊ.ɪŋ juːθ hæz ə wʊlf ɪn hɪz ˈbel.i/
"a growing youth has a wolf in his belly" picture

Idiom

a saying used to describe the large and constant appetite of a young person who is still growing

Example:
He just finished lunch and is already asking for a snack; truly, a growing youth has a wolf in his belly.
Keep the fridge stocked, because a growing youth has a wolf in his belly.