A trans
woman (male to female for those uninitiated) who is attempting to present as their assigned gender at birth to avoid difficulties when
people might notice they have transitioned.
For example, a boymoder might
cut her hair short and wear baggy clothing in preparation for a family gathering so her family doesn't know she transitioned.
"I hate being a boymoder. Working from home is
nice, but whenever I have to come in for a meeting I'm looking out of place with my
casual baggy clothing."