Pig-ass and pig-wife are not insults (snicker snicker).
Sure sure sure, the words pig-ass and pig-wife sound like offshoots of that faddish collection of “yo mama is so fat” jokes (“yo wife is so pig ...”). But here the word pig means a type of earthenware container. A pig-wife sold those containers (compare fishwife, a female fish
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vendor ), and a pig-ass was the donkey that hauled them around. Note: These words are spoken by a professional on a closed course. Do not try them at home, because you’ll get walloped before you get a chance to blurt out even the first few words of their real meaning.