Green’s Dictionary of Slang

marijuana.

1961		T. Taylor Baron’s Court All Change (2011) 31: ‘Pot — Shit — Tea — Gunja — Tampi — Reefers — Weed — or if you want me to be really square — Indian Hemp!’.
1975		Marks & Johnson New Eng.-French Dict. of Sl. [Spears].
1976		Peter Tosh ‘Legalize it’ 🎵 Some call it tampi, some call it weed.
1980		S. McConville ‘Prison Language’ in Michaels & Ricks (1980) 525: Other names [for cannabis] include [...] tampi.
1995		Francis-Jackson Official Dancehall Dict. 51: Tampi marijuana.