The translation of donkey’s years? A really long time. This saying refers to the fact that donkey’s have long ears, which rhymes with “years,” which means a long time... Got it?
If you hear it, the appropriate answer is not, “No he’s not, my uncle is Jack.” Bob’s your Uncle actually means “there you go!”
A chin wag actually refers to having a good old gossip or a catching up session with someone. Usually accompanied by a good old English cuppa (cup of tea). Don’t get it? Well just think about how your chin moves up and down when you talk, not really a wag but somewhere near.
It's been donkey's years since I had a good chin wag :)