My daughter alerted me to last week's Graham Norton show when he discussed the slang word dench (Dame Judi Dench, the actor, was one of his guests). Here's the clip. Dench apparently means 'cool'. It was popularised after the rapper Lethal Bizzle used the name as the brand name for his range of clothing. I don't think he was thinking of Dame Judi at the time, although the fact that she wore one of his baseball caps helped sales of the range (see this article).
This meaning of dench has not yet made it into hard-copy dictionaries. Interestingly, dench is in the OED, but as a Middle English spelling variant of Danish.