What s a bummer lamb?

"Bummer lamb" is not a commonly used phrase, so it's difficult to say for sure what it means. It could be:

* A slang term for a disappointing or unfortunate event. This is based on the word "bummer" meaning something unpleasant or disappointing.

* A playful or sarcastic way to refer to a lamb that is causing trouble or behaving badly. This is based on the word "bummer" sometimes being used to describe someone who is annoying or frustrating.

* A specific breed of lamb. It's possible that "bummer lamb" is a regional or local term for a particular type of lamb.

Without further context, it's impossible to say for sure what "bummer lamb" means.

If you can provide more information about the context in which you heard the phrase, I may be able to give you a more specific answer.