The act of giving someone a "little something extra" to close a business deal or any other request or arrangement. This generally refers to a handjob, but could include anything up to and including all manner of sexual favours.
My wife wanted some new furniture, and I had said no, but when she closed the deal with a "Carlson Handshake", the next thing you know I am at the store buying a sofa with an extended warranty!
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