A Manhack from HL2 is a flying drone with a sharp, spinning blade.
I was thinking of a manhack launcher that would operate by first pressing Sharp aim, which will put you in something that looks like the 3D sniper rifle. When you press fire, the gun will shoot manhacks that go to the area you directed and rip apart any enemies in the area. If you place the reticle directly over an actor and fire, the manhacks will lock on to that actor and attack it untill they get destroyed or the target is dead.

Picture:
http://images1.wikia.nocookie.net/half-life/en/images/4/4b/Manhack.jpg

I have to admit I would love to fight agains't a mob of manhacks their like little moving blenders.

No sharpaim. Mouse users don't have a sharpaim button.

Alright, maybe you can press fire to get into targeting mode, and press fire again to release the Manhacks.

Mouse users sould stop being such ♥♥♥♥♥♥s and use keyboard only controls like real men.

I hope to see this done in the near future.
I don't think its that complicated to make (Not exactly in your way, but in a simpler way).

Keyboard users should stop being such nazis and demanding everybody use their favorite control scheme or die.

Touché, good sire. Touché.

Clever people should stop saying touché, it gives me nothing to argue with.

Why not just make it like the Gmod manhack gun? Spawns manhacks which are then totally AI controlled.

I'd rather have it like the Unreal Tournament spider mine layer, where you can guide them with a laser. Except it's a crosshair like in the 3D sniper mod, and smaller.