Wiktionary
a. (context idiomatic UK English) embellished. adv. (context idiomatic UK English) (context manner English) Extremely; in a similar way, but taken to an extreme.
Usage examples of "with knobs on".
So it's all prancing around wearing padded waistcoats and waving swords with knobs on the end so no–.
So it's all prancing around wearing padded waistcoats and waving swords with knobs on the end so no-one'll really get hurt, isn't it?
There was the parchment and the book on the table, and the closet with knobs on its outside that was the transporter.
Because the other kingdoms look to the Djel, they say there's a family that really knows its pyramids, connysewers, they say we'll have what they're having, if you please, with knobs on.
It's really just closed-circuit TV with knobs on, except most of the knobs don't work at the moment.