Green’s Dictionary of Slang

to slap, to smack, usu. a child.

1892		I. Zangwill Children of the Ghetto 77: Father [...] potched my face after I was a married woman. I shall never forget that slap.
1999		M. Feldman ‘All The News That Isn’t’ 17 Apr. at NotMuch.com 🌐 Ken Starr asks Congress to eliminate his job and potch him real hard on the tuchise with a paddle.