What is laying one down?

to produce excrement
(other slang:
Steam one out
Launch the submarine
Drop the kids off at the pool
Pinch a Loaf
fertilize
move the bowels
stink it up
squat and grunt
revisit food post-digestion
feed mr. flushie
push one through
take a crap
make a shit storm
Clean the poop chute
roll a dirty burrito
making homemade sushi rolls
excrete