from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. Chiefly British To rejoice or celebrate with boisterous public demonstrations.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To celebrate in a boisterous manner.
from the GNU version of the Collaborative International Dictionary of English
- intransitive v. to celebrate publicly with boisterous rejoicing and hilarious and extravagant behavior.
from The Century Dictionary and Cyclopedia
- To give way to a frenzy of enthusiasm; celebrate a victory with a delirious uproar.
- n. A particular act of mafficking. See maffick, v.
After Mafeking, South Africa, town with a British garrison besieged for 217 days during the Boer War whose relief (May 17, 1900) was celebrated in London.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from Mafeking punningly treated as a present participle, from the celebrations in London after the relief of Mafeking during the Boer War. (Wiktionary)