A siphoner witch who is also a vampire
"Damn it that is not a vampire, that is a heretic, he is very powerful"
by AlphaWolf881 March 20, 2020
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one with controversial opinions about religion, politics, etc. extremely rebellious against government
halo 2, heretic leader opposed prophecy
by Tyler D Stenbuck July 10, 2005
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Anyone who engages in actions, statements, or thoughts against the Imperial Truth of the God-Emperor of Mankind.

Such categories for groups that would be classified as Heretics include, but are not limited to: Furries, SJWs, anime girls, communists, anarchists, Nazis, environmentalists, etc.
Furry: UWU

Brother Midael: "Heretic! I've got you now!" *Proceeds to decapitate the furry heretic*
by The Doge-Emperor of Dogekind February 2, 2020
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A broad term usually applied to: Orks, furries, feminists, college students, Tumblr users, Reptilians, and ten year olds.

According to the Heresy Decree by the Law of the Imperial Truth, any members within these groups is automatically deemed a heretic.
Brother Midael: "The heretics......... the lowest form of living creature in reality."
by Weaponized Dank Ootism June 24, 2019
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A broad term usually applied to the lowest forms of humanity out there: Orks, furries, feminists, college students, Tumblr users, Reptilians, and anime goddesses.

According to the Heresy Decree by the Law of the Imperial Truth, any members within these groups is automatically deemed a heretic.
According to the Codex Astartes, "All Heretics are to be purged instantly. If non-Heretics are found sheltering, befriending, or in any way expressing sympathy to a Heretic, they are, themselves, Heretics, and are to be purged at once."
Brother Midael: "Heretics....... the lowest form of creatures in existence."
by Weaponized Dank Ootism June 24, 2019
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This mf DT deadass trippin, kids next door is boo boo checks compared to Teen Titans
That mf so Heretical he be lyin all the time
by Uzio August 17, 2021
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