Boof is a slang term for low-quality cannabis.

Boof cannabis is low in resin coverage and has been poorly grown, dried and manicured. Boof cannabis is predominantly available on the black market. 

Boof can also be used as a slang verb for inserting a suppository CBMP. 

Patients boof cannabis suppositories 10 cm into their rectum. Boofing will help cannabinoids enter the bloodstream more rapidly than oral ingestion and without passing through the liver.