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1.
It's like when you're invited to a party, and you don't show up and it doesn't really matter.
Vietnamese Guide: What mean expendable?
John Rambo: It's like when you're invited to a party, and you don't show up and it doesn't really matter.
by Der Uberspieler September 27, 2006
 
2.
capable of being sacrificed in order to accomplish a military objective.
in the event of war every enlisted personnel in the military is expendable.
by jbmeira May 17, 2010
 
3.
The worst guild in Lost Saga. With a leader who swears/curses, disconnects, complains/whines, brags and talk trash a lot.
Player 1: Hey dude, did you join Expendables yet?
Player 2: HELL NO! That guild stole all ShadowRose members!
by OreoCuukie April 13, 2011