I don't do a lot of term coining on here but I thought this would be important so here goes (ignore the hat it's not centered idk I can't fix it)
Birthday Boy/Birthday Boygender!
What does this flag/term mean?
A flag/term for anyone who wants to reclaim the term "birthday boy". This can be used by anyone but is intended for folks who have experienced transandrophobia (regardless of whether they are a transman/transmasc or not) or have been referred to as a "birthday boy". Again though, personal experiences of transandrophobia are not required for you to use this term.
The alternative meaning is a gender that is related to being a birthday boy, or being a boy in a way that is related to birthdays in some way. This is inclusive of anyone who identifies as a boy in any capacity, regardless of presentation or appearance (eg, "feminine" boys, BIPOC boys who fall outside of the western definition of boy, Intersex boys, or whatever your specific case may be).
The meanings of the colors:
Dark purple: Represents power/strength or resilience
Lighter purple: Compassion/kindness
Blue: Masculinity, of any shape or form
Red: Rebellion, specifically against sex and gender binaries, and also oppression of any kind
Some other forms of the term for those who don't indentify as boys would be:
Birthday Girl/Birthday Girlgender
Birthday Enby/Birthday Enbygender (Or Birthday Enban/Birthday Enbangender)
Birthday Abinary/Birthday Abinarygender (that one's a work in progress)
If you don't see yourself represented in those terms, feel free to make your own :D
EDIT: if this is already a term consider it an alternative version :)