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.
Someone who never shuts up, excessive chatter.
Brock is such a fucking motor mouth, my fucking ears are hurting.
Someone who talks incessantly.
I wish that motormouth would shut up
is a reality show on VH1 which showcases people unknowingly being taped in their cars while singing a song. It began airing October 26, 2004.
The skits would end when the victim stopped and the cast went in and Zane would say to them, "You've been Motormouth-ed