A protective shield or barrier made of energy to protect or isolate a person, area or object.
Captain: Computer create a forcefield around the warpcore in main engineering!
Computer: Specify frequency pattern...
Captain: I don't give a damn just create a forcefield!
*Forcefield activated*
I was taking a piss in the dunnies and this demi-fag taking a piss next to me was looking at my cock without any attempt at being covert. I got stage fright and turned on my anal forcefield.