CK in UK slang stands for "Cheeky". It is used to describe someone who is playfully rude or mischievous.
Here are some examples of how CK is used in UK slang:
- "That was a bit of a cheeky comment, wasn't it?"
- "He's a right cheeky chap."
- "I'm going to pull a cheeky one on you."
It is important to note that "cheeky" can be subjective and the meaning can vary depending on the context. While it is often used in a playful or humorous way, it can also be used to describe someone who is being disrespectful or rude.