The disturbed Staten Island teen accused of killing his mother’s boyfriend allegedly gave a full, gory confession – including that he planned to liquify the body in a blender and flush it down the toilet, starting with the brain, law-enforcement sources said.

Damien Hurstel , 19, allegedly calmly admitted to cops at the NYPD’s 120th Precinct that he fatally bludgeoned the 45-year-old sanitation department worker over the head with a meat tenderizer because he wanted to know what it was like to kill someone, sources told The Post.

The alleged spare-no-details confession came after cops took Hurstel, who has a long history of mental illness, into custody Monday evening, according to the sources. 4

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Hurstel allegedly told police the brutal slaying unfolded after he argued with hi

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