I visited a lady who was talking to me about her teenage grandson, very good in computer skills.
She said, "Ti ilun i'e' ilu-ña." (He doesn't have the head of an i'e' fish.)
I said, "Ha?" "Haftaimano i ilu-ña i i'e'?" (What? How's an i'e' head?)
She said, "Tåya' sanhalom-ña." (There's nothing inside.)
In other words, the young man has smarts.
The i'e' fish, called "juvenile jacks" in English, is a small fish that can be eaten whole and entire, either fried or in kelaguen style (like a ceviche; lemon, onions, salt, chili peppers).