饭桶 (fàntǒng) Rice bucket; an incapable person; nebbish

Usage:

“饭桶”的字面意义是装米饭的桶。常用来比喻无用的人或者只会吃饭而什么事也不会做、没有能力的人。
“饭桶”literally means a rice bucket. It is a metaphor of an incapable person who cannot do anything.

Sentences:

1、Tā zǒngshì fàn cuò, guàibude lǎobǎn mà tā fàntǒng.
他总是犯错,怪不得老板骂他饭桶。
He is always making mistakes; no wonder his boss calls him a nebbish.

2、Zhème jiǎndān de shìqing dōu zuò bùhǎo, nǐ zhēnshì ge fàntǒng.
这么简单的事情都做不好,你真是个饭桶。
You even cannot finish such a simple task. You are a good-for-nothing.

原文链接