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2.
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)
by Remi Mailhot November 05, 2005
 
1.
to "repay" for a sexual act in an equal sexual matter, 69
When Stacy was finished giving Dan head, he decided to reciprocate and ate her out.
by Kat November 19, 2003