前心贴后心

前心贴后心

Literally means:

one's belly clings to one's back

Actually means:

With no food inside, the front and the back layers of one's stomach stick to each other. It means that someone is extremely hungry or that he is penniless.

胃里一点食物都没有，胃的前后壁贴在一起。形容肚子非常饿。也指钱包空空的。