University of Otago students
It's used mostly by uni students to describe a particular type or stereotype of students. Typically a partier who likes to drink, probably vape, etc, doesn't lead a particularly healthy lifestyle and is here more for parties than actual uni. Usually laid back, a little messy, enjoys drinking, sociable, and into the student culture.
"He's a typical breatha. Lives for pint night, sesh's and the boys."