from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang An unethical, unscrupulous practitioner, especially of law.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
from the GNU version of the Collaborative International Dictionary of English
- n. A trickish knave; one who carries on any business, especially legal business, in a mean and dishonest way.
from The Century Dictionary and Cyclopedia
- n. One who does business trickily; a person without professional honor: used chiefly of Iawyers: as, pettifoggers and shysters.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a person (especially a lawyer or politician) who uses unscrupulous or unethical methods
Probably alteration of German Scheisser, son of a bitch, bastard, from scheissen, to defecate, from Middle High German schīzen, from Old High German skīzzan.(American Heritage® Dictionary of the English Language, Fourth Edition)
The origin is mostly likely from German Scheißer ("incompetent worthless person"), from scheißen ("to defecate"), probably influenced by -ster (Wiktionary)