1. most covered with or containing grease or oil
Usage: superlative form of greasy
2. most unpleasantly smooth or ingratiating in manner
Usage: informal; superlative form of greasy

Examples

• This is the greasiest pizza I’ve ever eaten.
• The mechanic’s hands were the greasiest after working on the engine all day.
• That was the greasiest sales pitch I’ve heard in years.
• The greasiest part of the kitchen is always around the fryer.
• He gave me the greasiest smile when asking for a favor.
• These are the greasiest french fries on the menu.