noun

• (British, Ireland, Australia, South Africa, New Zealand) An absorbent garment worn by a baby or toddler who does not yet have voluntary control of their bladder and bowels or by someone who is incontinent; a diaper.
  "You will notice that disposable nappies are sold in boy and girl versions. They vary in where the thickest padding is provided."

verb

• (transitive) To put a nappy on.
  "The mother nappied the baby."

adj

• (US, informal, sometimes offensive) Of hair: tightly curled or twisted; frizzy (often specifically in reference to Afro textured hair)
  "They could scarcely bear their knowledge, nor could they have borne the sight of Rufus, but they knew why he was in the streets tonight, why he rode subways all night long, why his stomach growled, why his hair was nappy, his armpits funky, his pants and shoes too thin, and why he did not dare to stop and take a leak."
• (rare) Inclined to sleep; sleepy.
  "After supper I felt nappy and dropped right off to sleep."

adj

• (of a drink) Foamy; having a large head.
• (of a horse) Nervous, excitable.
  "‘He's a mutton-fisted beggar; but the horse is a bit nappy, and young Roger'll be the man to keep him going at his fences.’"