Question

if mice could roar 2.what does the phrase 'bullies be buttered on toast' mean? ​

Answer 1

To butter means to spread butter, usually on bread or toast, so " [if] bullies [could] be buttered on toast" is imagining that bullies could be spread as if they were soft as butter. A bully is often spoken of as a "tough" or "hard" person, so to wish they were soft is the opposite. "Lost in the post" means lost in the mail.