Top Definition
A term thrown around mostly by people on tumblr. People who haven't seen the sun in long enough begin to hallucinate vividly, or get severed from the real world. When eventually they completely lose logic, common sense, and any sort of related characteristics relevant to a healthy human being, they imagine these strange things called headmates. Headmates are a weird mix of schizophrenia, too much time looking at a computer screen and cheetos. It's supposedly described as having multiple personalities in your head, sometimes one taking over, another while you're watching a movie, another takes over at a feminist convention rally. People who have these supposed headmates are probably bipolar and belong in sanatoriums, but free speech keeps them in their basements.
"I have two other Headmates, frank!"
"Lemme call the psychiatrist"
by SaucyTobasco December 16, 2014
Photos & Videos
A headmate is an "Alter" of someone who has Dissociative Identity Disorder. A headmate is their own person who has split off from the original person's mind, who has their own separate wants, goals, needs, gender, age, etc.

These headmates are usually formed as a coping mechanism, helping the person with DID to survive the traumatic experiences that they have been a victim to. A collection of headmates including the host is called a Multiple/Median System.

Due to the large amount of systems on Tumblr, it has been wrongly labelled as a "Tumblr trend" and been accused of mocking mental illness, despite it being a mental disorder in itself.
headmate,alter,DID,dissociative identity disorder,mental illness,tumblr,system,multiple,
by 6yrhters April 24, 2016
An alternate personality or identity living in your head. Similar to a roommate or a house mate, but inside your skull. A person who describes themselves as having headmates is saying that they have people living in their heads who they have conversations with.

Some people can claim different ethnicities or sexualities, thus allowing them to join an autonomous caucus (for instance queer or women’s) that they were not otherwise entitled to join.

When they are acting as the personality of one of their headmates, they call this "fronting"

Related to Otherkin, Multiple Systems, and Tumblr social justice activist
I was so out of it I blacked out and one of my headmates took over and drove the car home.
by psuedon April 07, 2013
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