Pork Butt

RickUK

So, here i sit in UK and want a little US terminology  clearing up, Pork Butt, in the UK a Butt is the backside or i would class it as Leg Joint, am i correct in thinking what is classed on here as pork butt is a shoulder of pig with the leg boned out and skin cut off? this is what i have used prior and it works so i am just after a bit of clarification, or if someone knows the correct terminology i can say to butcher 

baychilla

Pork butt is also known as Boston butt is also known as pork shoulder.
https://en.wikipedia.org/wiki/Boston_butt 

It looks like pork shoulder on the bone is the UK term for the bit.

Sometimes skinless, sometimes boneless.