from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To move or run clumsily or heavily.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To move heavily and clumsily.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. move around heavily and clumsily
Perhaps blend of gallop and triumph.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from galumphing in Lewis Carroll's Jabberwocky, where the meaning was different. (Wiktionary)