A cinnamon roll is a European and American pastry typically served drenched in an icing. It consists of a long string of bread rolled into a circular shape, with added cinnamon, as the name suggests. The icing consists of cream cheese, vanilla, sugar, and butter. It can be poured on the cinnamon roll, or if you're mentally insane, you can dip the cinnamon roll into a cup of icing.
Person 1: Today, I had a cinnamon roll for breakfast!
It’s like that time you went to the store, all of a sudden there’s cinnamon all over your socks. Possibly also a reference for stashing drugs in your socks.