a completely self-absorbed, unaware "friend" (READ: douche) that you do things for *all the time* that NEVER returns the favor, even in times of crisis, always making the excuse that they're working or busy or just *can't* for whatever reason--always an excuse--ANY time you ask them, no matter what; someone who never returns the many favors you've done for them.
"My Dad just died and I can't find sittage for the funeral tomorrow. Since I've watched your kids for free for the past two days, do you think you can sit mine for a few hours while I go to my Dad's memorial service?"
Non-Reciprocating Tool: "Tomorrow? Oh, no way. Sorry. Gotta work online and stuff. You know. Busy and all. Can't. Maybe next time."
To repay for something that was given to you.
To be nice and give back to someone who gave you something.
"Now without making any sudden movements, give them an energon goodie" -Kup
"This is getting expensive!" -Hot Rod "Don't worry, they'll reciprocate." -Kup
"I thought they were supposed to reciprocate! No more!" -Hot rod (Taken from the Transformers movie)