At first, I was confused that this was on the same album as "Big Dumb Sex", but the more I thought about it, the more I figured it's just a metaphor for peer pressure in general, and encouraging people to get involved in things they shouldn't ("get on the snake, everyone else is doing it", etc). It could also be another, subtler jab at butt rock, with the way that everyone's dirty mind thinks the title is a double-entendre at first glance, but the actual meaning is different.
At first, I was confused that this was on the same album as "Big Dumb Sex", but the more I thought about it, the more I figured it's just a metaphor for peer pressure in general, and encouraging people to get involved in things they shouldn't ("get on the snake, everyone else is doing it", etc). It could also be another, subtler jab at butt rock, with the way that everyone's dirty mind thinks the title is a double-entendre at first glance, but the actual meaning is different.