One of the many ways of referring to the toilet

Referring to it in this manner suggests use of it for a number 2 rather than any other activity one can undertake in a toilet, such as a number one, number three, a Rippee, snorting benzoylmethylecgonine (coke) or other drugs, drawing weird pictures on the wall (graffiti) or even having sex.

Variants include:

shitter, john, crapatorium, lavatory, w.c,
fudge hole, shitbox, crapbox, watering hole,
outhouse, pooper, loo, latrine, honey truck,
interactive urinal, spend a penny, restroom, pissoir,
backhouse, house of ease, little house,
house of office, waste disposal facility, the dunny,
the brothel, dung-house, comfort room, bidet,
dumpster, the den, bathroom, lady's room, little girls room,
mens room, little boys room, crapper, poop hole, doodoo hole, toilette, eau de toilette,
One-man Conference Room

the thing that you don’t have when you’re phones percentage is over 20