"你是坨屎"用英语说可以表达为 "You are a pile of shit"。

这是一种非常粗鲁的语言，它的来源可能是由于屎被视为极其讨厌和有毒的东西，因此把某人或某物比作屎，表示鄙视或厌恶。

例句：

"You are a pile of shit, and I don't want to talk to you anymore." (你是坨屎，我不想再和你说话了。)
"That movie was a pile of shit, I can't bepeve I wasted my money on it." (那部电影真是坨屎，我简直不敢相信自己浪费金钱看了它。)
"He's such a pile of shit, I can't stand to be in the same room as him." (他是个坨屎，我简直不能忍受和他在同一个房间里。)

请注意这样的表达方式非常不礼貌，不应在正式场合使用。