fun ways to say taking a shit

chopping a log

pinching a fat loaf

making a butt burrito

laying a brick

building a dookie castle 

having the splatters

clearing the pipes

makin' a stinky! 

squeezing one out

leaving a floater

using the porcelain throne

releasing the kraken

dropping anchor

baking brownies

farting solids

doodooing

going number 2

dropping a deuce

excreting feces