I think a few people have come up with kanking independently. It's not that much a stretch from porkin'.
But yes, I like it, been using it with my vulgar characters.
Hm...let's see, something useful. . .
I like to use the differences between the city states:
Blunt as a nakki'.
Ugly as a stormer.
Shifty as a tuluki. Or, better yet, "Don't dance around the subject like some feckin' tuluki."
"Get to the point like a good 'nakki."
"You've got the manners of a stormer."
Hah, one could even use the cities of other cultures.
Sarcastically, "he's about as civilized as a Ptarken." Though this would go over many commoner's heads.