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."
Soap that kills 99%-99.99% (depending on how bold the marketers are) of germs without using water. You'll usually find hand sanitizer in classrooms, offices, and stores.
I didn't use Purell's hand sanitizer since it only killed 99.9% of germs. It seems much safer to use CVS' generic hand sanitizer since it kills 99.99% of germs.