adj

• (informal) Thin, generally in a negative sense (as opposed to slim, which is thin in a positive sense).
  "Her recent weight loss has made her look rather skinny than slender"
• (informal) Of food or a beverage, having reduced fat or calories.
  "...into the skinny chocolate milk?"
• (of clothing) Tight-fitting.
  "skinny jeans"
• (golf) Synonym of thin (“type of shot where the ball is struck by the bottom part of the club head”).

noun

• (colloquial) The details or facts; especially, those obtained by gossip or rumor.
  "She called to get the skinny on the latest goings-on in the club."
• (informal) A low-fat serving of coffee.
• (nonstandard) A skinny being.
  ""Either a skinny had judged (correctly) that it was worth one of their buildings to try for one of us, or one of my own mates was getting mighty careless with fireworks" .."A congregation in church — a skinny flophouse — maybe even their defense headquarters. All I knew was that it was a very big room filled with more skinnies than I wanted to see in my whole life.""

verb

• (transitive, informal) To reduce or cut down.
  "Like an accordion at a country wedding producing sweet-and-sour notes, some importers are expanding their U.S. retail automotive operations while others are skinnying down."