What is the Scottish meaning of crying up lum?

"Crying up lum" is not a phrase with a specific meaning in Scottish Gaelic or Scots. It's likely a misunderstanding or a phrase specific to a particular region or dialect that isn't widely recognized.

It's possible you might be thinking of a similar phrase, like:

* "Crying up the chimney": This phrase can be used in Scots to describe someone being very upset or angry, perhaps to the point of yelling loudly.

* "Crying down the chimney": This phrase, similar to the above, can also describe a person being extremely upset or angry.

However, without further context, it's difficult to determine the exact meaning of "crying up lum." Could you provide more information about where you heard this phrase or how it was used? This might help clarify the intended meaning.