at university in leeds, doing physics, one of my fellow Nottingham natives got so bogged down with the concepts he practically invented 'give a sh!t...' as I couldnt...you get the picture !!
couldnt care less - my interest is already at absolute zero. you could freeze helium3 on my care for the subject in question...
couldnt give a monkeys/sh!t/toss are usual expressions among the English.