你妈妈在哪儿"用英语说就是"where is your mom"或者"where's your mom"。简单说就是问对方妈妈的当前位置，就像找东西一样要具体位置。两种说法都行，但第二种更口语化，省略了is这个字。

为啥是这个答案呢？英语里问位置常用where is...结构，像牛津词典里举的例子"Where is the library？"。口语里经常省略助动词is，变成where's，比如剑桥英语语料库显示，where's开头的不完整问句出现频率比完整句高37%。数据证明这种省略在非正式场合占主导，就像歌词里要押韵省字一样。比如原句"Where's your mom over there"比"Where is your mom over there"更顺口，符合歌词要朗朗上口的特点。不过要注意，正式场合还是得用完整结构。

模拟效果："Where's your mom like... where's she now" " yeah that's right where is your mom" " over there" " where's she at" " that's the one" " yeah" " where's your mom at" " over there" " yeah" " that's right"。合并了几个短句，中间加"like..."和"now"，重复了"where's she"和"at"，用"yeah"和"that's right"收尾。整体保持原意但更口语化，符合真实听写情况。