Idk is one of those words that people who are not too Internet-savvy might need some help to decipher. Idk is an abbreviation of the phrase I don't know. Idk is most commonly used in informal communication, such as text messaging. There are no formal rules about the capitalization of words like idk.

What does IDK mean slang?

IDK. I don't know.

Does maybe mean no?

"Maybe" does not mean yes or no. When someone says "maybe", they will almost always show body language that reveals the true answer, or change their tone of voice when saying "maybe." If you cannot see them or are unsure, then you must await their ultimate decision.