Figging is the practice of inserting a piece of ginger root into the anus, vagina, or male urethra. Originally applied to horses in a practice known as gingering, it now most-commonly refers to a practice in BDSM.
If the person being figged tightens the muscles of the anus, the sensation becomes more intense.
See also 
Further reading 
- Lady Green (1998). Kinkycrafts: 99 Do-It-Yourself S/M Toys for the Kinky Handyperson. 206 pages