Green’s Dictionary of Slang

(UK drugs) a variety of marijuana.

2015		Section Boyz ‘Trapping Ain’t Dead’ 🎵 I don't want no cheesy / Tell ’em amnesia, cause I’m needy.
2018-20		T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Amm – cannabis (abbreviation of Amnesia, a potent strain).
2015		Jme ‘Man Don’t Care’ 🎵 She’s lighting up some sensis, he's lighting up amnesias.
2020		G. Krauze What They Was 63: We get a couple of boxes — two kilos of amnesia — and break them down into smaller bits [Ibid.] 67: Not Nice comes past me, smell of ammi following him.