a motor mouth
A person who talks incessantly or irrepressibly. Jake is such a motor mouth that I find it exhausting talking to him! You need to quit being such a motor mouth in the classroom!
get (one's) motor running
1. slang To make one excited. Listening to classic rock songs just gets my motor running—I love trying to pick out all the different instruments being used! Stamp collecting doesn't interest me in the slightest, but it really gets Bill's motor running.
2. vulgar slang To cause one to become sexually aroused. His French accent really gets my motor running!