Bees, like all insects, have six sections to their legs: the coxa, trochanter, femur, tibia, metatarsus and tarsus. Each is connected by a joint and the one most like a knee is between the femur and tibia.
just a theory but how does all good fake news begin ?
perhaps we need to ask Boris
theory :-
it's from Italian immigrants to the UK/US pronouncing 'the business' (important, good). This sometimes happens where natives imitate non-native immigrant phrasing and it gets absorbed. .