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An incredibly lazy person who spends far too much time on video games or the internet for their own good.

A typical Jabbamuffin would happily scrape through life as a gold farmer, rather than get a real job.

Most definitely experiences multiple mmorpgasms in his or her lifespan (which is probably equal to around 25 years; at a push).
"Jimmy, get off that computer. I don't want you to become a Jabbamuffin!"
by Jabbamuffin April 12, 2009
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