Quote Originally Posted by paulb
This is a little speculative, but I don't think cobblers were respected in ANY medieval society. So "lying like a cobbler" may not be a specific sort of reference at all, like "parties like a frat boy". It just represents a general sort of judgment.
You see, "врать" in Russian, at least in Russian of XIX century, means not only "to lye", but also "to tell rubbish". In the contenxt milljw is asking about it means exactly "I'm telling rubbish", not "I'm lying". So I'm pretty sure the phrase means "I'm telling rubbish [like a drunk man]".