i can do everything else apart from move, any one heard of this or know how to fix it?
Once you're stuck, no. Not even the noclip command will get you free. Here's what you can do to avoid it, though:
When you enter the building, walk around the bum and try to position yourself so that when you talk to him, you're facing the door you came in through. When the dialogue is over, you'll still move, but you should be in a position that doesn't get you stuck.
The problem is that if you have the exit to your back when the dialogue ends, the bum leaves the building and pushes you aside. You end up getting stuck in the wall, or between the wall and some debri.
poppolulu is correct about Tin Can Bill. You just need to find a bum in the streets to talk to and tell you where he's at. Then the truck in his alley will clear out and you'll be able to reach him.