1. (Noun) Someone with excessively frizzy or curly hair. They often get self-concious of there nappiness and call the kid that sits behind them nappy even though he keeps his hair under control. Occasionally they will also get jealous of his shoes and go buy a pair for themselves. But, he cant blame her because he does have some pretty nifty kicks.
2. (Noun) Brittish term for diaper.
1. Ashley was self-concious of her borderline-dreadlocks so she nicknamed Michael "nappy" and stole his shoes.
2. Ashley was never potty-trained and still wears a nappy.