1. [late 19C+] (orig. Aus.) to prepare, of food, drink, a marijuana cigarette etc.
2. [1930s] (US Und.) to create confidence or apparent friendship, for the sake of enticing a victim; thus built up adj.
SE in slang uses
see under spliff n.
[1950s] (US) to deceive, esp. for a merchant to cheat a customer.
see under biscuit n.1
see under time n. (1)
see under sconce n.2