wioioiog

It is a police siren, and is valid in any scrabble game.

Popo car go wioioiog

Eel in Mongolia

To have no idea what you are doing or to lack experience in a given area.
Explanation: There are not eels in Mongolia, so an eel in Mongolia would likely have no idea what they are doing and lack experience

“Like an eel in Mongolia”
“I have about as much experience as an eel in Mongolia”
“Do you know what you are doing? About as much as an eel in Mongolia”