BSH is a shorter way of saying Brick Shit House or for those not allowed to curse in font of their parents. When talking about something that is tough to move, heavy or someone who is jacked diesel or big and strong.
In the game Left 4 Dead, while playing as infected, the team Booms, Smokes, and then Hunts in rapid succession. It is considered the most effective and efficient method of killing the survivor team.
**The Round Begins**
Harbinger: "Alright, everyone get set up."
The_Unseen1: "I'm in position for the BSH."
Sir Paul: "I'll boom them from up-top, you good to smoke?"
A generic location implying the relatively hip and swanky West End (or West End in Manhattan) as opposed to relatively scuzzy City. See also CS (Cannon Street).