To inform a television or screen character of impending danger under the assumption they can hear you.
Sandra: No, don't go in there! The killer is hiding behind the door!
Jennifer: Why do you always have to fictate when we watch movies together?
To give instructions to sports teams or individual players on sports teams in the assumption they can hear you and will comply with your instructions.
Every time my Dad watches sports, he fictates by yelling things at the players like "aaaaaaahhhhh behind you" or "shoot the puck" and the ever present "what are you doing?!"
1. to create a fictional story impromptu
2. to tell blatantly false statements, generally made with intent to deceive (to bullshit)
dude you're fictating, and i don't know why. return to reality, man.
i can't believe you'd fictate; i can't trust anything you say now