wheelhouse

Area of knowledge or skill used as the justification for delegating an unpleasant task or claiming unearned merit.

Hey, I was wondering if one of you guys could mock up some invites for my twin daughters' thirteenth bday? I know it's not technically your job, but I figured it's right in your wheelhouse.  

The douchebag who said this probably also said Game Plan, See if It Sticks, or Downstream.