Demiguy, also called a demiboy, demiman or demimale person, refers to someone whose gender is only partly male, regardless of their assigned gender at birth. It may also refer to an individual who was assigned male at birth, but does not wholly identify with this gender. While a demiguy may identify partially as a boy or man, the label suggests they do not subscribe to the gender binary. Because a demiguy sees themselves as only part boy or man, the other part could be girl or woman, or even something that falls under the non-binary umbrella, such as agender or genderqueer.
The term demiguy is believed to have emerged along with demigirl in 2010; it was added to the Gender Definitions Masterlist maintained by the Asexuality Visibility & Education Network (AVEN) on December 12, 2010. By 2014, "demi" as a gender prefix had become relatively common.
A few Pride flags have been proposed to recognize demiguy as a gender identity. Although no official flag exists, most include blue and gray or blue and white strips.