Julietian is a duaric orientation, referring to wlm (women loving men). It can refer to straight women, bisexual women, pansexual women, and any other women who experience attraction to men. The term is typically not used as an orientation on it's own. The term is typically used by non-straight women to talk about their attraction to men, but straight people are included in the definition.
The male equivalent to julietian is romeric.
History
The term appears to be coined along with the flag on June 27, 2018 with a submission to the Tumblr blog beyond-mogai-pride-flags[1]. The names romeric and julietian were based off Romeo and Juliet.