"Garge" is a derogatory term regarding an "animesexual". It generally means someone is a filthy, lonesome hermit, and it has been applied to "animesexuals" because of their lonely, filthy status.
Person #1: "I heard that Jake unironically identifies as an animesexual."
Person #2: "People like him are mocking valid sexualities and slowing down progress. What a garge."
The term "garge" is a derogatory term directed at animesexuals. It refers to one who is lonely and filthy, as people who identify as animesexual are supposed to be by the user of the term.
"Wow, I heard Trey really identifies as an animesexual."
"That's harmful to LGBTQ+ people and compares a joke to a valid sexuality, he's such a garge."