A (non-existant and fictional) adhesive used to glue your asshole shut to prevent diarrhea. While originally coined by Miami Herald humor columnist Dave Barry, the term has persisted in the drug culture due to the persistent diarrhea experienced by opiate addicts during withdrawals.
The proposed name for this product/service was 'Rectite.'
It is unclear if the product made it out of the development stage. This may be an urban legend, although Snopes.com has no entry for it as of 2-June-05.