The Ashkenazic Jewish (Yiddish) counterpart to the Sefardic Jewish (Ladino) "kasher", both derived from "kashrut". The antonym is "treif"; literally "torn", broadly "unclean" or "inedible".
Actual conversation on YouTube video "Re Seth Porges and Chipoltes (Not For Those Sensitive To Profanity)", in reference to Chipoltle's trief incident with pinto beans:
Kosher is a pain to keep up with
roark100 24 minutes ago
@roark100 So are hospital bills for Chron's, Cholitis, etc.. Meanwhile, I indulge ocassionally (i.e., the infamous Farrell-DeBoy crap soup, guaranteed to scratch your intestines out if you eat too much; and that's why I have only one bowl at the family reunions). But actually, kosher is relatively easy-- simple rule of thumb: if you wouldn't eat it, it's probably not kosher. "If you wouldn't eat it" includes dogs, cats, shellfish (Look up what they filter.), horses, Spam, bats, & other non food.
Nickidewbear 3 minutes ago