The Vietnamese word "mỏ khoét" is a colloquial term that literally translates to "scooping mouth." However, in everyday usage, it refers to a person who eats a lot or has a big appetite. It can imply that someone frequently eats or enjoys food very much, often in a casual or humorous way.
Using "mỏ khoét" is usually light-hearted and fun, but it's important to know your audience. Some might find it endearing, while others might consider it a bit rude if used inappropriately.