What does ACDC stand for in slang?

Excuse me, could you please clarify what the acronym "ACDC" stands for in slang terms? I've heard it used in conversation before but I'm not entirely sure of its meaning. I'm curious to learn more about its origins and how it's commonly used in casual speech. Is it a reference to a particular group or movement, or perhaps it has a more playful or humorous interpretation? Thank you for your help in shedding some light on this matter.