Smokin batshit refers to something somebody says or something you may see or read that is so stupid, beyond any possible redemption that the only way it could have been made was if the author was "smokin batshit."
I was at the car dealership the other day and asked how much to replace a brake light bulb. The guy tells me-with a straight face mind you-$47.00! I said "Dude you're 'smokin batshit,' yes guano, that savory crap found in a bat cave."
by C55 May 1, 2018