Fear of falling. It's very similar to acrophobia (fear of heights) but not quite the same. Can also be written as 'basophobia'. Every baby has this, exept some grew out of it.
Oh fuck no I ain't gonna do sky diving dude. I have basiphobia, you idiot!
The overwhelming fear or phobia that Bonnie from Five Nights at Freddy’s 4 will run at you at full speed the instant you turn the lights off after using the bathroom in the middle of the night.