A phrase meaning "So there you go.", "That's why this situation is the way it is.", "That's why this is there.", "That's why I did that.",etc.
Originally started at a High school in Arizona.
(Joe pulls out a sandwich)
Unknown Person "Joe, you're eating lunch?"
Ramesh: "Yeah, Hence the sandwich!"
Person One: (Looks at person two's cast on arm) You broke your arm?
Person Two: Yeah, hence the sandwich.
(Person One throws their wedding ring at person two)
Person Two: We're getting a divorce??
Person One: Yeah, hence the sandwich.