Pappe

a german nickname for the drug LSD (Lysergic Acid Diethylamide), referring to the material of it's blotter.

Translation: (die) Pappe - cardboard, colloquially: thick paper
Plural: Pappen
IPA: ˈpapə

German:
Person 1: Ich werde drei Pappen nehmen.
Person 2: Ich werde nur eine Pappe nehmen.

English:
Person 1: I will take three Pappen.
Person 2: I will only take one Pappe.