Derived from the video game "Half Life 2" a "manhack" is a small flying drone armed with three sharp blades that would chase the main character, Gordon Freeman, around during the early levels of the game. This term has been adapted in recent years to describe any AI or remote controlled roto-craft such as helicopter or quadrocopter that is out of human control.
::Two guys in a field::
Guy 1 : So I just got the new firmware uploaded to my co-pilot chip lets try it out.
Guy 2 : Shouldn't you test that out with the engine control unit unplugged?
Guy 1: Fuck you guy.
::1 minute later ::
Guy 1 : Ahhhh manhack!