Definitions:
a drug taken illegally for recreational purposes, especially cannabis

a stupid person

information about a subject, especially if not generally known

a varnish formerly applied to fabric surfaces of aircraft to strengthen them and keep them airtight.

administer drugs to (a racehorse, greyhound, or athlete) in order to enhance or inhibit sporting performance

smear or cover with varnish or other thick liquid

add an impurity to (a semiconductor) to produce a desired electrical characteristic.

very good