These are related to a short story I'm trying to wrap up:
* Is there a specific street in Sigil associated with brothels? I'm thinking something like, say, Patpong in Thailand -- and if you know what I'm talking about, you should be ashamed of yourself you dirty sod, you! -- where someone could be walking down looking for "negotiable affection". A reasonably well-known street near Sigil's red light district (again, does it have a canon one?) would suffice too.
* What sort of single-word expletives are there in cant? I'm thinking something on the level of "motherf***er" in English; something really vile that someone desperate might hurl as an epithet towards someone they hate. I'd especially like something that feels good in the mouth when you hurl it at them; "leth-piker" is one I usually go with, but I'd like something even stronger here.
* Similarly, what's the most extreme intensifier in cant? "Bleeding", "sodding" and "piking" are too commonplace; again, in much the same moment, I need something as vile as possible for someone to spit out and "f***ing", though accurate, doesn't quite seem cantic.
My need didn't go away, it was just submerged for a time 
re: #1 - not that I know of, but I'll pass the question to our Sigil guide writer
re: #2 - loth-lover? I don't know. There was a thread on insults earlier: Here
re: #3 - Technically - since cant is based on cockney english - "bloody" *is* the strongest intensifier. It's just to us casual planewalkers, we cuss like sailors.
Anything more than that you'll want to look at the3 Mimir's dictionary as it'll have to be made up.