MtNB 

"Male to non-binary", someone who was born as a woman but identify as non-binary. Not widely used and controversial for some. Mostly use they/them or neopronouns.

"Are you a man or a woman?"
"I am MtNB, I use Ne/Nem pronouns."

MtNB by richtoesucker March 10, 2021

MtNB 

(LGBT) Initialism of male-to-nonbinary (transgender or transsexual).

I am an MtNB nonbinary person.

MtNB by aetinx June 9, 2024