Greasy stuff is a term used to describe substances that are oily, slimy, and often have an unpleasant smell. The term can be used to refer to a variety of substances, including GOOP (4 letters), GUNK (4 letters), and LARD (4 letters). GOOP is a slang term for a sticky, slimy substance, while GUNK is a term for a thick, greasy substance. LARD is a type of fat that is solid at room temperature and is often used in cooking.