Never heard about the horse either; the cabbage thing is a translation of "non me ne importa un cavolo" (I don't care a cabbage), which is just a self-restraine

Never heard about the horse either; the cabbage thing is a translation of "non me ne importa un cavolo" (I don't care a cabbage), which is just a self-restrained version of the more common "non me ne importa un cazzo" (I don't care a dick)