"cat," 1530, but probably much older than the record, perhaps imitative of the hissing sound commonly used to get a cat's attention. A conventional name for a cat in Gmc. languages and as far off as Afghanistan; it is the root of the principal word for "cat" in Romanian (pisica) and secondary words in Lith. (puz), Low Ger. (puus), Swed. dial. katte-pus, etc.
"the face," 1890, slang, from Ir. pus "lip, mouth."