多用户地牢是一个地方的英文：
MUD

mud是什么意思：
n. 泥；诽谤的话；无价值的东西
v. 弄脏；抹泥；钻入泥中

Your explanation is as clear as mud.
你的解释一点都不清晰

I fell smack in the mud.
我正好跌在烂泥里。

Their lorry got stuck in the mud.
他们的货车陷到泥里了。

They were not using criticism but mud.
他们并不是批评而是诽谤。

My car was stuck in the mud.
我的汽车陷在泥里不能动弹。