Transmasculine is an umbrella term refering to anyone who transitions to a more masculine gender. This term is used to include both binary trans men and certain nonbinary, people such as demiboys, in conversations where their experiences overlap with one another. That being said, not all transgender men will identify with the term transmasculine. Not all transmasculine people are transgender men.
While there are some who are intersex or were AMAB that identify as transmasc, it is a label that is generally associated with those who were AFAB.
People who identify as transmaculine generally wish to appear more masculine, either through physical bodily means, gender expression, or both. Some transmasculine people will undergo surgeries and hormones, while socially presenting with feminine clothing and/or make up. Others will go full masc. Some will only change clothes/presentation without any physical transition.
Regardless of gender presentation, like any trans people, transmasculine individuals are often subject to not only transphobia but targeted transandrophobia.
For the purposes of providing examples of what sorts of things a steryotypical transgender man would seek out, I will be describing a binary transition. Please keep in mind that not every transgender man seeks out everything on this list. Everything mentioned has varying levels of how common they are. This is simply for demonstration, and helping anyone unsure of where to start find the relevant pages on this website. Every transgender person has different levels of gender dysphoria and does different things to seek out gender euphoria. I'm no transmed - no one is more or less trans just because they get a surgery that someone else doesn't.
Most transgender men will change their names to more masculine-sounding ones. They will typically use he/him pronouns and overall masculine language. Though it can be difficult to do, depending on the location, many transgender men will undergo legal transition.
Most transgender men who are unable to obtain puberty blockers as children experience gender dysphoria regarding having breasts. A common short-term solution for dealing with these typically consists of binding; either via using a binder or using trans tape. A common permanent solution consists of getting top surgery.
Most transgender men will seek out HRT to deal with most aspects of bodily gender dysphoria. MHT helps a lot when it comes to passing as a man as it deepens the voice, causes facial hair growth, causes bottom growth, and overall masculinizes the body of the person taking it. Some men will try voice training to optimize their voices. Some men will undergo voice masculinization surgery or FMS if they are not happy with the results of TRT - though these last two surgeries are more uncommon.
Many transgender men experience some level of bottom gender dysphoria (aka. dysphoria regarding genitalia). Many transgender men will pack to have the appearance of a bulge (and sometimes stand to pee, depending on the packer used). Some trans men seek out surgeries such as meta and/or phallo to surgically obtain a neophallus. Some transgender men will get scrotoplasty to have balls, a hysterectomy to prevent pregnancy, or a vaginectomy to no longer have a vulva.
The pink stripes on the transmasculine flag represent femininity.
The blue stripes on the transmasculine flag represent both transitioning to masculinity and the spectrum of masculinity.