Carrot emoticon in Nateon messenger
A play on the phrase '당연하지' which means 'of course.' 당근 means carrot and due to the similarity with the phrase 당연하지, young people started saying 당근이지 as slang. 당근이지 literally means "It's a carrot."
In Nateon messenger there is a carrot emoticon which is used to mean "of course."