its a term used to put your arm around someone. you start with counting ur far shoulder away from them as one, two which is the closest one to them, 3 their first and 4th the farthest one on the other side and keep ur arm around them
Means the opposite of "broad shouldered" (to act strong and confident and carry alot of burden/responsility in your stride). People (usually a manager) acquire this title by dodging work and/or making decisions and generallypass the buck onto a subordinate. This is done to avoid blame or to avoid doing a task that may be boring.
Officeworker 1: Dave the manager has just given me a pile of accounts to work on thats going to be externally audited!!
Officeworker 2: But he's more qualified than you to do it! Jeez that guy has got such slopey shoulders!