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This word is used when a person sucks up all the fun out of a room and makes the atmosphere really boring

Like the way a normal sponge sucks up liquid
Sean is so dull, he's being a total funsponge.

Sean was being a total funsponge when he started talking about math
by Sexylegs April 17, 2009
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Noun. A boring, humourless person.
Who was that boring prat you were with yesterday? He was a real fun sponge!
by Dick Wright-Upham December 06, 2010
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The character Freddie Mclair from the television show Skins.
Cook: And why didn't we invite Freddie?
JJ: Cause he's a Fun Sponge
Cook: You got it
by seemejudgingyou September 08, 2009
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Someone who has the ability to walk into a room and litteraly soak all of the fun out of it. Also known as a muzz.
"Nick was such a fun sponge, the moment he arrived the party died."
by Doc Raymond October 10, 2003
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A person or group of people, who take an activity so seriously and or literally, that they squeeze every last drop of joy out of it.

Can be appropriately applied to cyclists who spend 10K+ on their bikes, clearly don't enjoy what they're doing and live for looking down on those with 'lesser' equipment.
"Did you see those Joe Serious bellends shaking their heads and tutting?"

"yeah, fun sponges every last fuckin' one of 'em"
by Itsallgoodman May 17, 2016
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A fun sucker, downer, negitive nacy party pooper or a downright joy killington.
Person 1: Man, lets go on a killer adventure!
Person 2: (AKA Fun sponge) Naw, im kinda tired. Plus adventures are for losers.
by Simple Jack and a sack March 24, 2009
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