What is the definition or description of: trans fats?

Trans fats: Cis and trans are organic chemistry terms for mirror images of the same molecule. Trans fats look the same but have different properties than the naturally occurring fats. In general i recommend avoiding consumption of trans fats.

Hydrogenated oils: Meats have some transfats, but most are manmade. Transfats are made by hydrogenating oils, which turns them into solids (shortening). Transfats are used in processed foods b/c they last longer on shelf that way -- cookies/pie crusts/chips/popcorn/donuts/creamer/margarine. They raise LDL (bad) and lower HDL (good) cholesterol, which leads to heart disease. Saturated fats are just as bad!