defecate (formal word)
Verbs unless otherwise noted.
Children's words (kids only!):
poop, go poo poo, make poo poo, go number 2, go potty, go, make caca, make doo-doo, make a B.M. (bowel movement)
Mommy, Kitty went poo poo on the carpet again!
Polite terms (euphemisms):
go to the bathroom, go to the restroom, powder ones nose (women), visit the little girls/little boys room, make a deposit, Nature calls! (exclamation), make a pit stop
If Helen wasn't really drunk at the party, why did Jeff find her making a deposit in the hall closet?
do one's business
Mitt was so stressed over the outcome of the Super Bowl that he was unable to do his business for a week, creating a football of another sort entirely.
crap, shit (crap is more polite than shit), take a shit, pinch a loaf, take a dump, drop a turd
After being fired, Jack showed his feelings by taking a dump in the top drawer of his ex-manager's desk.