I follow this girl down into the basement of a house because she is attractive. Behind the house is a yard and a river. Across the river and through some woods is a mud bog.

I go out to the mud bog, and I'm coming back, swimming across the wide river. A teenage boy is also swimming across, and when he gets close to me, I slap some mud on his back.

This seems to be the point of some game; if an older person slaps mud on you, you have to go all the way back to the mud bog to clean it off. Aww man, he seems to be saying, now I have to go all the way back, and then swim across again.