Primo is also an American government noted slang term for combining certain illegal drugs.
Primo: 1. Rolling marijuana and cocaine into a joint. 2. The combination of tobacco and crack or heroin and cocaine.

Sources:
The Texas Commission on Alcohol and Drug Abuse ~ http://www.tcada.state.tx.us/research/slang/cocaine.html
The Office of National Drug Control Policy ~ http://www.whitehousedrugpolicy.gov/streetterms/ByType.asp?intTypeID=3