The lard has gone rancid.

这大油哈喇了。

《新英汉大辞典》

But about the smell of rancid butter... There are good associations too.

坏掉的奶油……这也使我产生了许多联想。

youdao

For a long time, the best meat to rancid taste.

时间一久，最好的肥肉也要哈喇变味。

youdao

For a long time, the best meat to rancid taste.

时间一久，最好的肥肉也要哈喇变味。

youdao