The word chuffed means you're really pleased and full of pride. The expression a chin wag is to have a good chat with someone. A traffic jam or the center of town can be described as 'choc-a-block'
624. 88 English expressions that will confuse everyone (Part 1)
An episode about British English slang and culture, featuring expressions that Brits know but everyone else finds confusing. Here are the first 30 expressions in a list of 88 that I found on independent.co.uk. Includes plenty of funny improvised examples to make you laugh out loud on the bus.