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разбираться как свинья в апельсинах stresses
idiom.	know as much about something as the pig knows about oranges (постарался сохранить точность и сочность сравнения ART Vancouver)
inf.	be completely ignorant
разбираться, как свинья в апельсинах
gen.	not to know B from a bull's foot (Anglophile)
разбираться в чём-л., как свинья в апельсинах
gen.	know as much about sth. as a pig about pineapples; not to know a B from a battledore; not to know a B from a broomstick; not to know a B from a buffalo; not to know a B from a bull's foot; not to know B from a battledore; not to know B from a broomstick; not to know B from a buffalo; not to know B from a bull's foot; not to know beans; not to know chalk from cheese