The story
Suggesting that such a person, etc. would suck up the fun as a sponge sucks up water.
Etymology from Wiktionary, CC BY-SA 4.0.
fun sponge
Today it means: Someone who or something that takes the fun out of life; a killjoy. Full definition →
Today it means: Someone who or something that takes the fun out of life; a killjoy. Full definition →
Suggesting that such a person, etc. would suck up the fun as a sponge sucks up water.
Etymology from Wiktionary, CC BY-SA 4.0.