Yorkshire folk don't waste words, they're too expensive. The dialect is blunt, brilliant, and proud. If a Yorkshireman says owt nice to you, frame it. It doesn't happen often.
Berk
A berk is a fool, an idiot, the one who reverses into the only other car in an empty car park. It is a mild, almost affectionate insult in British English, far softer than it sounds, the kind you can say in front of your nan. More daft than offensive, despite some surprisingly rude roots.
Top-drawer
Top-drawer means properly first-rate, classy, the good stuff. You use it for anything that feels a cut above the rest: a player, a meal, a hotel, a performance, whatever's come out spotless and a bit posh. It's got an old-school British ring to it, like saying this didn't come from the bargain pile, it came from the drawer with the best bits in it.
Lark about
To lark about is to play and mess around in a carefree, high-spirited way, full of jokes and silly antics with no real purpose but fun. The lark here is the playful sense of a bit of mischief and adventure, not the bird. Kids lark about in the playground, mates lark about on a night out, and someone larking about is enjoying themselves and not taking anything too seriously.
Twaddle
Twaddle is daft, empty nonsense dressed up as if it means something. It’s the sort of chat that flaps its gums for ages and still lands nowhere. A very British word, a bit old-school, a bit sharp, perfect when you want to brush off some pompous rubbish without going full rude.
Witter
To witter is to rabbit on in a soft, harmless way about bits and bobs that don't really matter. It's the kind of chat that drifts rather than lands. Your gran can witter about the neighbours, your mate can witter down the phone, and half the time the point isn't the point at all. It's just cosy talk filling the room.