An it/its lesbian or itsbian refers to a lesbian who uses it/its pronouns but is still a woman or woman-aligned. The term is used by women who are wlw (sapphic) and use it/its pronouns. Those pronouns can be exclusive or one can be multipronoun. It is a more specific form of pronoun non-conformity and crosspronoun usage.
There also exists neopronoun gays, neopronoun lesbians, he/him lesbians, she/her gays, they/them lesbians, it/its gay people and they/them gay people.
History
It is unknown when this term was coined, however it has been used amongst the community for many years alongside terms such as he/him lesbian.
Flag
The it/its lesbian flags were coined by Tumblr user ultbee on February 3rd, 2019. They have no confirmed meaning.
Resources
https://pronoun-archive.tumblr.com/post/182527541061/now-presenting-the-itits-lesbian-flags-for
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Third flag.
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Fourth flag.