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1.
when the female partner of a couple brings the male another woman for his sexual enjoyment, often as a reward for his sexual expertise.

The word originates from the habit of cat owners who try to find homes for unwanted kittens by going door to door to see if anyone wants to adopt. In the metaphor, the second woman is like the kitten that is being brought to, or "dropped" on someone's doorstep.

There are numerous variations on this theme. For example, the couple may share the "kitten". However, when the person being dropped is male, it's generally called a "puppy drop".
She felt so hot for that man that she had to do a kitten drop.
by Kristin K. April 01, 2008