Maneen

n.

Heard in Tipperary, Offaly and Waterford

A young boy acting beyond his years. Also: Acts like a big man, But is usually just a teenager.

In use

The boy with the flat cap is a real maneen" "You're some maneen in fairness Shawn! Showin off in your shit car..

Posh English

The boy with the flat cap is a most precocious little fellow.

Same phrase, other counties