a good voice to beg bacon

Used to mock someone's voice as being strange, unpleasant, or inadequate (e.g., for singing). Bacon, being a dietary staple in older times, was often used as a metaphor for financial stability or wealth; having the voice of one who must "beg bacon," then, means having a harsh voice, like someone who is undernourished. Did you hear the way that singer was screeching last night? I'm glad we didn't stay too long, he had a good voice to beg bacon. I love Alice, but, my goodness, the girl has a good voice to beg bacon! Please do not let her sign up for the talent show. I like to sing, but only in the shower—I know I have a good voice to beg bacon.