Fanking
Fanking refers to sexual stimulation of a person's genitals whilst smoking a cigarette (fag), usually to the point of orgasm and is usually conducted within a locked automobile.

The stimulation can be performed manually, by other types of bodily contact (short of sexual intercourse), by use of objects or tools, or by some combination of these methods. Self fanking is a common form of autoeroticism. Fanking with a partner, called mutual fanking, is also common.

Communal fanking in large groups over an extended period of time is collectively known as a fankathon, short for fanking marathon.
Just got caught fanking in the morrison's carpark.