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
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...
Someone who stops everyone else having fun
*Beth and Aamy were giggling *
Justin: Stop being so immature
Beth: Well stop being such a fun sponge then.
Mark: I'm going to start saving up for a big musical shopping spree :P
Lizzie: Bills first...
The world: what a fun sponge
Fun Sponge is a person in a gaming community that is typically an admin that lets NOONE have any fun. They will no clip everywhere and watch your every single move! They generally take EVERY rule and hold tight to it! No one likes them...
During gameplay, The two fun sponges, Digitalkiller and Lazer, Banned me for having a trap door. They fun sponged me and by banning me.
Someone who won't do something because they are afraid of what others may think about them!
Fun Sponge = girl at party who will not ride mechanical bull cause she has a dress on...who is offered shorts and who conveniently forgets to tell you she has pants in the car...