The vagina.

Literally everyone, ever. Including the writer of this definition.

An obese female's vagina.

An insult, mainly towards a fat or obese person, male or female, who refuses to do anything about their wieght and just keeps on eating fatty and greasy foods, and they frequently use excuses that such as "I will always be that way" or "God made me this way". Other grease traps wallow in their own misery at the fact that they are so fat and sit in front of the T.V. eating a bag of Doritos and drinking a mcDonalds milkshake while watching Maury or Oprah when they could be working out instead of eating so much grease. This is why they are called grease traps, because they are aware of the problem, and will not make healthy chioces in order to change the situation.

A neighbourhood or place where greasy and ratchet people all converge. Crack heads, drunken teenagers, drag racers, and kids who linger around the McDicks that is open until midnight or later. Be wary when entering one of these. You may accidentally get sucked into its wormhole of greasiness.

When a over weight male can only have sex doggy style and has to put his stomach on the partners lower back. The sweat and grease build up between the two is known as the grease trap.

The often smelly crease of skin linking the ballsack or labia to the thigh.