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1.
1) A joinee is a member of the Join Me/Karma Army collective/cult; in essence, he or she has sent a small photograph of themself to Danny Wallace and promised to perform a random act of kindness for a stranger every Friday.

2) Joinees often refer to eachother as Joinee Blank, only with their last name instead of "blank."
1) Did you see that guy over there? He rushed up and paid for my meal before I could get out my wallet. I wonder if he's a joinee?

2) Joinee Jones is off making an old man happy.
by Jeremy Meerkreebs October 02, 2004