What does "Last Call" mean on CTAF frequency? At non-towered airports I sometimes hear pilot's using the CTAF use the term “last call” as they depart the traffic pattern. This is not listed in the AIM. 

What information is this suppose to convey and should I care?

Does this have some meaning internationally that I don't know about?
It means they are changing frequency and will not be making any more CTAF calls. As far as I know its not required although something along those lines is pretty common place. Personally I call: 


  Departing the pattern to the [north|east|south|west]


Its the self announce version of "frequency change approved"