배가 고파요.

I am very hungry.

My stomach is growling.

I'm famished.

I'm starving.

I could eat a horse.

 배가 불러요.

I'm full.

I'm stuffed.

I've had enough.

I can't eat another bite.

 빨리 해! 서둘러라!

Hurry up.

Make haste.

Make it snappy.

Do it quickly.

Step on it.

Step on the gas.

Get the lead out (of your pants)!

Have you got lead in your pants?

Get a move on.

On the double.

We haven't got all day.

We have no time to lose.