Green’s Dictionary of Slang

sacrament n.

[the placing of the pill or the blotter on the tongue, reminiscent of a Communion wafer]

(drugs) LSD.

1969		R.R. Lingeman Drugs from A to Z (1970).
1977		S.N. Pradhan Drug Abuse.
2001		ONDCP Street Terms 18: Sacrament — LSD.