Definition of file and forget:
(adj) :
Not requiring further control, feedback, or response after an initial action, launch, etc.
(n) :
(programming, attributive) The practice of transmitting or raising something, such as an event, and then proceeding without checking for any result or response.
(n) :
(military) A kind of missile guidance system which does not require further control after launch, and can hit its target without the launcher being in line of sight of the target.