Carbon buttprint 

A brown stain found on the back of someone's underwear.

I need to reduce my carbon buttprint.

You can start by doing a better job wiping your ass.

Carbon buttprint by J Scotts January 16, 2009

carbon buttprint 

1) The amount of carbon molecules used over a lifetime to produce and maintain a person's butt (including those used to produce contributing animal fats and to transport goods);

2) The amount of methane and other greenhouse gases produced by a person's butt over a measurable time period (e.g., a year or decade).

1) Al Gore may have reduced his carbon footprint by purchasing rainforest offsets, but his carbon buttprint remains equivalent to the annual output of a medium-sized Chinese coal-fired electrical generation facility.

2) The average US carbon buttprint is 4.6 times greater than the average buttprint of Zambia, New Guinea, or Ceylon.

carbon buttprint by Bob Zybach May 23, 2008