Definition: to enter a room / place in a very relaxed and carefree manner, as if there were no hurry.
E.g.1: Can you believe it! First he disappears for three days and I am worried sick and then he just breezes in as if nothing has happened.
E.g.2: You have to get me a more responsible secretary. I was in a middle of an important meeting and she just breezed in, watered the plants and breezed out again.
This phrasal verb cannot be separated.