Someone who is weak and cannot handle any level of spicy heat (from capsaicin) and/or any hot peppers. Resulting in their mouth watering profusely.
"My friend is so weak and such a Watermouth; he can't even eat a Bell pepper without his mouth water being able to fill a child's swimming pool."
by notwatermouth April 09, 2014
a person (usually a gay man) that spreads gossip and drama and generally minds everyone's business but his own. Watermouth typifies the bright red coloration of the lips on this type of person, as I'm sure you can guess why.
That morning producer is always talking about everyone else's personal matters. What a watermouth!
by Buttersworth January 27, 2009