The Full form of IKR is I Know, Right? IKR is an internet slang, a popular expression of agreement, commonly used in messaging, on line chatting, e-mail etc. It is considered as an informal response that is used by a person to express in harmony or agreement with another person’s view or statement, i.e. a friendly assertion by a person to show that he or she also has the same idea. Now days, it is one of the most common and popular internet slang used by youngsters over the internet.