ADDLE-COAVE: A not particularly friendly way to call someone an idiot.
BAR THAT. An almost-polite way to say “shut up”.
BARMIES. Insane folk.
BASHER: A neutral reference to a person, usually a thug or fighter.
BERK: A fool.
BIRDCAGE: A cell or anything that compares to it.
BLEAKER: Member of the Bleak Cabal.
BLINDS: T he dead-ends of the Mazes, it also means anything impossible or hopeless.
BLOOD: Anyone who’s an expert, sage, or a professional at his work. Calling someone a blood is a mark of high respect.
BOB: The business of cheating someone, whether it’s of their cash, honor, or trust.
BONE-BOX: The mouth, named because of its teeth.
BUB. Booze, wine, or ale that’s usually cheap and barely drinkable.
BUBBER: A drunk.
BURG: Any town smaller than Sigil, either in size or spirit.
CAGE, THE. This is a common nickname for Sigil. It comes from BIRDCAGE (see above), so it’s a pretty harsh judgment on the place.
CASE: The house or place where a cutter lives.
CHAOSMEN. A nickname for the Xaositects.
CIPHER. A faction nickname of the Transcendent Order.
CLUELESS: Folks who just don’t get it, usually primes. Use this on a planar and it’s likely there’ll be a fight.
CHANT, THE. An expression that means news, local gossip, the facts, the moods, or anything else about what’s happening.
CROSS-TRADE. The business of thieving, or anything else illegal or shady.
CUTTER. A term that refers to anybody, male or female. It does suggest a certain amount of resourcefulness or daring, and so it’s a lot better than calling somebody a berk.
DARK. Anything that’s secret is said to be a dark.
DUSTMEN: One of the factions of Sigil. They believe everybody’s dead.
FATED, THE: A faction of the planes which holds that if they’ve got something, it’s because it belongsto them.
GARNISH: A bribe.
GIVE ’EM THE LAUGH: Escape or slip through the clutches of someone.
GIVE THE ROPE: What happens to condemned criminals who uun’t manage to give the law the laugh.
GODSMEN: A faction of the planes that believes everybody’s got the chance to be a power.
GUVNER: A faction in Sigil that believes knowing physical laws will give a cutter power over everything. N
HARMONIUM: A faction of the planes. “Do it our way or no way,” could be its slogan.
HIGH-UP: Somebody with money and influence.
INDEPS: A faction of the planes whose members live their lives as they please, with no allegiance to others.
JINK: Money or coins.
KIP. Any place a cutter can put up his feet and sleep for a night..
KNIGHT OF THE POST or KNIGHT OF THE CROSS-TRADE: A thief, cheat, and a liar
LEAFLESS TREE: The gallows, which is where some berks wind up after they’ve been scragged.
LEATHERHEAD: A. dolt, a dull or thick-witted fellow.
LOST: Dead. “He got lost,” means he ain’t coming back without a resurrection.
LOST, THE: A faction in the planes, properly called the Athar. Its members hold.that there are no true powers.
MAZES, THE. The nasty little traps the Lady of Pain creates for would-be dictators. It’s also come to mean any particularly well-deserved punishment.
MERCYKILLERS: A faction of the planes that believes there is an absolute justice.
MUSIC: A price a cutter usually doesn’t want to pay, but has to anyway. “Pay the music or you’ll never find your way out of here.”
OUT-OF-TOUCH: Outside the Outer Planes.
OUT-OF-TOWN: On the Outlands.
PEEL: A swindle, con, or a trick is a peel. It’s often used as a verb. Peeling a tanar’ri is usually a bad idea.
PEERY: Suspicious and on one’s guard.
PIKE IT. A useful, all-purpose phrase, as in, “Take a Short stick and pike it, bubber.”
PUT IN THE DEAD-BOOK. Dead. Some people have others “put in the dead-book.’’
SCRAGGED: Arrested or caught.
SENSATES: Nickname for the Society of Sensation, a Jaction. Its members believe life’s got to be experienced to be understood.
SIGNERS: A faction nickname for the Sign of One. Its members figure everybody is the center of their own universe.
SOD. An unfortunate or poor soul.
TUKN STAG. To betray somebody or use treachery. Saying “he’s turned stag” is about the worst thing that can be said about a cutter.
As a general guide these are taken from 16th, 17th and 18th century slang of thieves, swindlers and beggars.
Edited from the Planescape Campaign Setting pages 95-96