D(M/F)AB = Designated (Male/Female) At Birth. It means what the doctor checked off on your birth certificate. It’s a term that was invented to avoid using “assigned” because for most trans* people designation/assignment was done with a pen, but for many intersex people (who may or may not be trans*) assignment was done through nonconsensual surgery (this is the original meaning of the terms Coercively Assigned Fe/Male at Birth). So because the two things are so dramatically different it’s best to I use different words for them.
mess at your "funny tumblr posts" being about people's self-identification
Sorry it's just really funny to me. I've been looking up this stuff since that thread on here. There's nothing wrong with it though if they honestly believe they're a plant it isn't harming me