In the Counter-Strike Source Mod known as Zombie Mod, an improperly thrown grenade (or any grenade thrown by a n00b) results in failnade, which instead of hurting the zombies, propels them forward into whatever spot you are trying to defend, resulting in failure.
The BirdMan, YeaH!: Fire in the hole!
ZOMBIEMAN X--> The Birdman, YeaH!
ZOMBIEMAN X--> chucknorris101
ZOMBIEMAN X--> ewbernoob3000
chucknorris101: Nice failnade Birdman...
The BirdMan, YeaH!: =D
A grenade, often in FPS games, that does not go where intended that may:
1) Bounce back and harm and/or kill you.
2) Miss the target completely.
I heaved a disgruntled sigh as I was obliterated by my failnade.