1. Substance D is a fictional addictive amphetamine-like psychoactive drug, also known as "
Slow Death", "Death" and "D", that is depicted in Philip K. Dick's novel "
A Scanner Darkly". It's derived from the fictional flower "
Mors ontologica".
2. By extension, Substance D can refer to amphetamine (speed).
"What he sold me as 'candy' actually turned out to be 'Substance
D'."
This is a more
subtle way to refer to
amphetamine in a conversation if you don't want to attract too much attention.
