He's a young whipper-snapper or young impressionable male. 2.) Nickname for a man in the urban community circa 1960. "Say, young blood you got a square?" 3.) He's a member of a territorial street gang in California.
Placket 16-17th Century. A woman. Historically, it's an apron or pettycoat. Women were known to work as slaves in the kitchen, the term grew wings and soared into the streets to define women as objects. "Our vicar thus preaches and why should he not? For the dues of his cure are the pocket and pot."