When you want to colloquially express that you don’t care at all about something, you might say “I couldn’t care less.” This phrase first popped up in British English at the turn of the 20th century and is still popular today. In the 1960s, a controversial American variant of this phase entered popular usage: “I could care less.” Many native English speakers, both in the UK and US, find this expression to be logically flawed. If you couldn’t care less, then it’s impossible for you to care any less than you do. If you could care less, however (and you want to be taken literally), you’re saying that it is possible for you to care less than you care now.