1. [1930s+] an opium pipe.
2. [1970s+] a pipe used for smoking marijuana; thus a pipeful of marijuana [? imported by veterans of the Vietnam War (1964–75), where pipes, rather than cigarettes were the preferred means of smoking].
3. [1990s+] a pipe of crack cocaine.
[1980s+] (US drugs) the smoking of a pipe or other container filled with cannabis.
[1960s+] to smoke marijuana.
SE in slang uses
see bag of fruit n.
see under jelly n.1