Noun
English Wikipedia has an article on:water balloonWikipedia
water balloon (plural water balloons)
A small rubber or latex balloon, filled with water and used as an informal weapon
I once threw a water balloon on a girl because I caught her cheating on me. She was kissing my friend and I thought, 'Oh, this can't be happening.' It was bad and I was much older than you think throwing a water balloon. I was 14. Breckin Meyer
There was nothing I wanted to do more than be unconscious again, wrapped in black, gone away. I was raw. I felt swollen with potential tears, like a water balloon filled to burst. Begging for a pin prick. Gillian Schieber Flynn