Transmasc is a shortened version of the term transmasculine. It's a broad umbrella term usually used to describe those who transition from female-to-male. All shades of masculinity fall under this term. You can be as much of a man as you want- it doesn't matter how feminine or masculine you feel or present yourself as.
Transition Process
(writing about how transition works for this identity)
Transmasc-Specific Things
(overview of experiences specific to transmascs