Generally East Midlands I would say. Certainly used a lot in Loughborough when I lived near there. To be used when someone from Manchester would say "chuck" probably, although more flexible because you can add "mi" (me) in there:I'd love to know where it started from, such an odd saying!
When we first come up here, and after years of no one talking to each other on the trains I used to travel to work on, the concept of strangers engaging in conversation was mind blowing and everyone called me "duck" !!
We still have the cob/roll debate in the office though, interspersed between endless talk of the football and how to pronounce words like gRass etc...
Hello chuck
Hello mi duck
Obviously the "u" is to be pronounced not as in "up" but maybe a bit more like double o (sort of). You can't really spell in accents!
