A 16-year-old boy has reportedly slashed off his manhood and almost killed his mum after he had feasted on what has been described as “super-strong” strain of Indian hemp.

The delusional teenager had reportedly gone to bed with a knife, as he started hallucinating, fearing that some people lived right inside the walls of his room.

He awoke in the dead of night and stabbed his mother before chopping off his own penis in what doctors said was “cannabis-induced psychotic episode.”

The boy’s dad told the BBC how the drug turned his otherwise “very bright, bubbly lad” into a paranoid “waste of space.”

“He basically had a psychotic episode and did huge amounts of harm to both himself and his mother,” the distraught father said.

The family’s identity could not be revealed because the boy is underage.

The man said his son tried smoking Indian hemp with a few friends before becoming “completely addicted.”

He said his son had delusions, believing mermaids were real and thought “people were living in the walls.”

Meanwhile, the teenager has reportedly undergone several operations to re-attach his penis, but doctors said he would still require further surgery.