Noun. A boring, humourless person.
Who was that boring prat you were with yesterday? He was a real fun sponge!
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"
Random man: I don't want to wear a rubber.
Paula Abdul: Don't worry, I'm using a fun sponge.
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
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."
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.
A person or group of persons who have the uncanny ability to absorb all of the fun out of something, not unlike a sponge...
Person 1: I say its such a wonderful day, shall we partake in a light spot of fornicating the establishment...
Mikeey: No..... *Sound of fun absorbtion fills the air*
Person 1: You sir are such a FUN SPONGE...