Peg can have many meanings. They main one being Poly, which is a term for Ethylene Glycol. Ethylene glycol is a synthetic liquid substance that absorbs water. It is odorless, but has a sweet taste. Ethylene glycol can be found in different brands of antifreeze for cars, airplanes, and boats. You can find more information here: http://www.atsdr.cdc.gov/tfacts96.html#bookmark02
