A sexual act between 3 people. When a guy has someone to his left and right (can be either male or female). Each of the individuals use one of their hands to jack off the guy.
The term 3 hand sandy is short for a 3 hand sandwich which became very popular in gay bath houses in the 70's.
Jim: "What were you doing all that time in the steam room with Bob and Ted?"
John: "We were all sitting on the bench and they decided to give me a 3 hand sandy."
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