Oh, Zhan Zheng Xi, you little cinnamon roll, how I love you (▰˘◡˘▰)

Ok. I am so ignorant but I have to ask... what does it mean to be a "cinnamon roll"?? I think it means being cute/adorable and it sounds as something sweet to eat... but where does the word/meaning come from? sorry if it's an annoying question....

http://knowyourmeme.com/memes/beautiful-cinnamon-roll-too-good-for-this-world-too-pure