1) when you are urinating after defecating, and you proceed to defecate small, jelly-bean shaped waste from your anus. 2) a way of humorously describing a reaction to something that is really bad, or something that you wish to exaggerate. 3) a massive watery diarrhea burst.
1) When I got the piss shits last night while sitting on the bowl, I got piss water in my ass. 2) I got so freaked out by that dude jumping out from behind the wall, I got the piss shits. 3) I ate at White Castle last night and got a severe case of piss shits.