J patty is a Jamaican Beef Patty (soft dough which surrounds a spicy beef mixture). It is typically sold by street venders and is commonly found in train stations, subways, or very low class dinners. It is served at room temperature and has shelf life of about 3 months. However due to its texture and form it is possible to be sold a J Patty that is at least 3 years old and you may never know. Regardless of its age a J Patty will produce the same effect on the human body. A restless night of making love to a toilet out rear-end.