So why "brackets"?
I can't really say. Narratively as an expletive, it doesn't really work I'll confess.
She was going to have some sort of Tourette syndrome genetic thing going on where she can't do proper
expletives, but she's grown beyond that as I've written her.
Currently, she just substitutes expletives with odd words because she's cute like that.
Much funnier than expletives anyway.
(Does sound a bit like one.)
I've also seen "Motorscooters."
I've used odder expletives.