I'm pretty sure this is a reference to Austin Powers, where he's giving the Irish hitman a swirly in a casino bathroom and yelling "WHO DOES NUMBER 2 WORK FOR" while a gambler played by Tom Arnold in the next stall is trying to encourage him on.
Some people are blessed with normal bowel movements with average amounts of fiber. We participate in a CSA so have dozens of pounds of veggies every week. Every meal is veggie heavy. My body doesn't care, it's a lazy ass.