The classier (and cleaner) way to say "I don't give a fuck", "I don't give a shit", "I don't give a crap", "I don't give a damn", etc.
(Do NOT confuse it with I could care less. If you *could* care less, it means that you can reduce the amount of fucks you give!)
Synonyms for I couldn't care less
On this page, you will find 30 slang terms related to I couldn't care less. Some of the top words include: ks0n, wonderful, poo poo, frigg, i don't give a fah, and 25 more.