It only takes a minute to sign up. I have heard a couple of times recently the phrase "don't piss on my boots and tell me it's raining", usually in the context of a heated argument so I've hesitated to ask speaker what exactly he meant by it. Can anyone here help? It suggests that the person you're upset with is harming you, making an unbelievably brazen claim that they are not, and that you have seen through their meagre attempt at deception. There are a few variant forms.
Can you advise if you have the origins of these phrases? And if not I wish you happy hunting. The best I can do is point to a progenitor, the slang term prawn for a fool, perhaps from the idea of a prawn being a stupid-looking marine animal. The evidence suggests that the fuller expression was a product of service slang in World War Two, perhaps in part based on this usage.