Boseulachi, occasionally spelled boslachi, was a South Korean insult formed from the words boji ((보지) "vagina") and byoseulachi (벼슬아치 "bureaucrat").
History
Some say the word originated during the 90s in the early days of Korean internet communities in PC Tongshin. But the word boseulachi is said to be emerged in 2006 on South Korean internet forums as a term South Korean men use to describe vain and egotistical women. It was ordinarily directed towards a girl or woman with an aggressive personality. The usage of the word waned after 2014.
Related expressions
A related expression was Doenjang Girl. A Doenjang Girl seeks luxury and is vain and proud.