1.Definition: coated or covered with oil
"Oily puddles in the streets"
2.Definition: containing an unusual amount of grease or oil
"Oily fried potatoes"
3.Definition: smeared or soiled with grease or oil
"Get rid of rubbish and oily rags"
4.Definition: unpleasantly and excessively suave or ingratiating in manner or speech
"An oily sycophantic press agent"