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3.
a guy or girl who makes out with anyone and everyone, usually the people they kiss are close together chronilogically.
1: "I heard Barbara made out with Johnny and Mike at the party on Friday."
2: "Ew. Gross. I heard she was kissing Shane, too."
1: "Gah, she's such a mouthwhore."
by theGirlinBlue May 23, 2009
 
1.
Any individual who is known for having a wang in the mouth - perhaps even multiple wangs at one time. A mouth whore is so obsessed with having wangs in or around his or her mouth that on the odd occasion that there is no wang in the immediate vicinity, this person will waste away just thinking of how many wangs might fit in his or her mouth on a good day.

Antonym of mouth virgin.
Phil Collins is the biggest mouth whore on this planet.
by LeeboZeebo April 18, 2005
 
2.
One whose oral cavity is used exclusively for the purpose of giving head.
"Piss off out of my face you nasty little mouthwhore".
by Skameequa September 13, 2003