Top Definition
An annual gathering in the city of London, where participants dress like Jesus and go on a pub crawl via various religiously named bars and pubs. Nominally to raise money for charity, but in reality, to offend as many cranks as possible.
"You going on the Christathon this year?"

"Of course, I built a 9 foot Crucifix with a sound system for just that occaision!"
by Jonny_yeah April 14, 2009
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