Bugger or "buggar" is a slang word. In the United Kingdom, the term is a general-purpose expletive, used to imply dissatisfaction, or to refer to someone or something whose behaviour is in some way displeasing or perhaps surprising. In the US, particularly in the Midwest and South, it is a slang but not offensive noun meaning "small critter."
buggar is popular to use in the UK
The term 'buggar' is general-purpose in the UK. That means a lot of people use it on a general basis. The model probably wasn't sure if that meant the same thing or not