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(Image: HANDOUT)

Nikko Jenkins said he was told by Apophis – an ancient god who appeared as a giant snake – to make his member look like the reptile.

The lag, who murdered four people in a sick killing spree, needed 27 stitches after the painful procedure.

It comes a few months after Jenkins tried to slice his tongue like a snake and smeared the blood over his cell walls.

The 27-year-old has also carved 666 – the number of the Devil – and the word "Satan" into his head.

(Image: GETTY)

Officials are unsure how Jenkins, who is banned from shaving and is kept in a private cell, keeps getting hold of blades.

Marshall Lux said: "You really have to question how this keeps happening.

"Nobody seems to know exactly what he’s got or how he's getting it. It's a mystery to me."

(Image: AP)

Jenkins is currently awaiting a death-penalty hearing for his killing spree in Omaha, Nebraska two years ago.

He brutally murdered Juan Uribe-Pena, Jorge Cajiga-Ruiz, Curtis Bradford and Andrea Kruger between August 11 and August 21 2013.

But the hearing has been delayed because Nebraska is set to hold a state-wide vote on whether to bring back the death penalty.

He cuts himself so he can "use the insanity defence" and "embarrass" officials at the Nebraska State Penitentiary, according to prosecutors.