Mississippi Mudpump 

A sex act
Give a women laxatives, and then when they kick in proceed with anal intercourse so that she spurts "mud"

Read definition and then apply the Mississippi Mudpump.

Mississippi Mudpump by Satyricon October 16, 2006

Mississippi mud pump 

When someone receives a blow job while taking a shit.

I'm horny and I've got a turtle head poking out, how about giving me a Mississippi mud pump to help things along?

Mississippi mud pump by Mr. Miss June 28, 2009