(no subject)

Rereading Lust Over Pendle, and have hit a bit of a snag. Most of the Britishisms I've managed to sort out by context or being enough of an Anglophile to already know what they're on about, but...

I suspect most of them hear "Longbottom" and add mentally "Bring your own whippet".

I'd try to explain the context, but I'm not even sure which parts are relevant. Help?