bpdulog

Everyone here is right.  Ohai’s definition is correct if you look at quotes on the market, and pass hungry definition is correct from the perspective of someone making a market.  
With regards to the original question, wouldn’t the rate you use be based on how you hedge the trade?  FX stuff isn’t as intuititive to me, but if you look at market making options, you need considering the hedge instrument bid/offer prices when making a market (i.e. the price you are willing to buy a call will depend on the price you can sell the underlying, and vice versa).  So presumably, if you make a market for FX forwards, wouldn’t the same logic apply (i.e. you buy an FX forward, you sell the spot, and vice versa).