[ ˌpɪkə'ju:n ]
N. Amer.
■ adjective informal petty; worthless.
■ noun
1》 informal an insignificant person or thing.
2》 US dated a small coin of little value, especially a 5-cent piece.
Origin
C19: from Fr. picaillon , denoting a Piedmontese copper coin, also used to mean 'cash'.