from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Offensive Slang Used as a disparaging term for a person from east-central Europe, especially a laborer.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An immigrant from Eastern or Central Europe.
- n. A brawny or coarse person.
Bo(hemian) + alteration of Hung(arian).(American Heritage® Dictionary of the English Language, Fourth Edition)
Probably Bohemian + Hungarian. Compare hunk, hunky, honky. (Wiktionary)