Yiddish: He's got a cat in his head.

He can't remember anything.  SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh  Alternate form:

He's got a cat-in-the-head.  |  Er hot a katsnkop.  |  .ער האָט אַ קאַצנקאָפּ

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh

ער האָט אַ קאַץ אין קאָפּ.

Er hot a kats in kop.

He's got a cat in his head.