Figging involves not the fig itself. It refers not to any fruit. Rather, it refers to a particular use of the rhizome of the ginger plant, itself more commonly used as a consumable or medicine. This practice is a sexual one.
The root is taken and carved to leave a thick flange at one end. The other end is narrowed, curved, made more comfortable for a most uncomfortable use. The root, burning, raw bits and all, is inserted into a sensitive area. This is traditionally given over into the anus. Uses of the vagina and the urethra for this fetish are also recorded.
This fetish is a masochistic one: as one might assume, the root is said to burn quite uncomfortably. Figging is predominantly a BDSM activity, though, as previously mentioned, the root also had quite a bit of medicinal impact when applied to the anus.
Also known as gingering when applied to the anus of a horse for medicinal purposes rather than to your lover for sadomasochistic purposes. If you have taken the horse as your lover, it is not applied to the meaning of gingering.