from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Informal A smart aleck.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A self-assertive and arrogant person; a know-it-all or smart aleck.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an upstart who makes conceited, sardonic, insolent comments
wise1 + German -enheimer (in such surnames as Oppenheimer).(American Heritage® Dictionary of the English Language, Fourth Edition)
wise + German surname suffix -enheimer (Wiktionary)