Usage of "a big maybe"
Hi, I have a question about usage of "a big maybe".
(the scene description)..sorry I'm not great at it..
--They have a situation. They are trying to break a bad witch's spell, and they don't speak Latin. One isn't sure whether they will be able to read properly a witch's textbook (written by Latin) or not.
(Here are some of the quotes from the TV show I have been watching.)
Tara ; What if we pronounce something wrong and instead of breaking her spell, we start a plague of locusts in here?(in an upset tone)
Holly ; magic is about energy and intention. I'm thinking "maybe" the goddess will know what we mean, even if we say it wrong.
Tara ; That's a big f..... "maybe"! (in a really upset tone)
As for "That's a big maybe!", what does she exactly mean by that?
Would you teach me how to use this "a big maybe", please?
(Is there "a small/medium maybe"?)
I would greatly appreciate your help.