Green’s Dictionary of Slang

cone n.

[resemblance]

1. [late 19C] (US) the head.

2. [1920s] (Aus.) the nose.

3. [1980s+] (Aus. drugs) a metal cone with a hole in the centre, usu. made of aluminium or brass and used for smoking cannabis.

4. [1980s+] (US drugs) a conical cannabis cigarette, which is tapered by rolling with two or more papers glued at an angle.

SE in slang uses

In phrases

give cone (v.) [the image of licking an ice-cream cone]

[1980s] (US teen) to fellate.