Talk, etc. nineteen to the dozen
Definition 1 of 1
Pro Tip 1/3Speedy Speech
Use when describing someone who speaks very quickly without stopping. 
Every time she gets excited, she starts to talk nineteen to the dozen.
Pro Tip 2/3Informal Context
Best used in casual conversations rather than in formal situations. 
When we met up for coffee, Jim was talking nineteen to the dozen about his new job.
Pro Tip 3/3British Origin
Primarily used in the UK, might not be well understood by English speakers from other regions. 
The British tourist was talking nineteen to the dozen, and I could barely keep up!