How to say it: Pronounced "shee-ay."
What it means: Literally, "to shit."
When it's used: Not usually invoked to refer to doing "number two" (that's faire caca). Best used in one of its lively retinue of expressions (see "Raunchy relatives").
Raunchy Relatives: Tu me fais chier!— like emmerder, "You bug the crap out of me."
C'est a chier—"It's not worth a shit."
les chiottes—"the can, the shitter."