mouthwatering might have come by conditioning ,because the response to the stimulus becomes associated with the other causing "mouthwatering".
Yes.
The waiter placed a mouthwatering meal in front of a group of ravenous customers, and immediately regretted it.
mouth watering
Similie. When you use like or as that is a smilie. :)
i think James said in the book twilight, that Alice had very mouthwatering blood.
two
Metaphor
It is a similie as you are comparing (something) to how sly the fox is. A similie uses the words "like or "as".
yummy,mouthwatering and scrummy
a simile is something that has "as and like" in it
Weak as a kitten.