Definition of "MAAB"

I am a FAAB (female-assigned-at-birth) genderqueer, and I have a good friend who is a MAAB (male-assigned-at-birth) genderqueer.

2013, Joe MacDonald, An Autoethnography of Queer Transmasculine Femme Incoherence and The Ethics of Trans Research, Emerald Group, page 145