Someone who never shuts up, excessive chatter.
Brock is such a fucking motor mouth, my fucking ears are hurting.
by John Harrison October 19, 2004
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a person who is very talktive
This motor-mouth always follows me around at lunch time. I am sick of listening to his mindless chatter.
by Light Joker July 11, 2005
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an old hag who rambles about fantasies of knowing mob, celebrities, anyone famous.
Mildrid: I know John Gotti Jr oh hun a plate of spaghetti

Mildrid: I had dinner with George Bush hun and we went to his ranch in texas
Mildrid: I have 10 billion dollars hun i dont need anything

Mike: Goddamn motor mouth mildrid shit the fuck up!
Mildrid: What? ::launches off into another fantasy dweller diatribe::
by ScoutmasterAndrzejRAWR6969 April 15, 2023
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