One of the more horrific items of practical jokery, basically a "liquid filled" used condom thrown at a (soon to be former) friend or preferably an enemy as you would a water balloon. Not Recommended if you want to remain popular, or indeed, alive.
"Well your honour, I stabbed him 40 times as the previous day he got me in the face with a particularly well filled spunkbomb, covering my skin my clothes, and possibly my soul, with foul salty seminal fluid"
by Kris April 7, 2005