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1.
Otherwise known as "spit".
Alison: "Ew! You just got your mouth water on me!"
Caroline: "Oops, sorry."
by Am0o0ney April 25, 2009
 
2.
The saliva that comes out of your mouth when you feel like you are about to throw up.

Something that tastes so juicy.
Oh my god I have mouthwater, uhhh.

Oh its so good it tastes like mouthwater.
by joel g August 15, 2008