"crazy, silly," 1916, slang, of unknown origin, perhaps connected to potter (v.). Earlier slang senses were "easy to manage" (1899) and "feeble, petty" (1860).
potty (n.)
1942, child's word for "chamber pot," from pot (n.1). Potty-training is attested from 1958. Potty-mouth "one who uses obscene language" is student slang from 1968.
例文
1. The baby has done a wee in his potty .
赤ちゃんが便器におしっこをこぼした。
2.The kids are driving me potty !
この子たちは私にうんざりしている!
3.He seems to have gone/to be quite potty .
彼は気が狂っているようだ。
4.He is potty about comics.
彼は漫画本に夢中になっている。
5.A person with his ambition won 't stay long in a potty little firm like this.