* He could talk the paint off a wall.
* His mouth runs faster than a cheetah.
* His voice could wake the dead, and then keep them talking.
* He's got a voice that could melt glaciers.
* He could chat up a storm.
* He could talk the legs off a chair.
* He's a walking, talking encyclopedia (of gossip).
* He's a human megaphone.
* He could talk the ears off a donkey.
Remember, a hyperbole is an exaggeration, so choose the one that best fits the situation and your sense of humor!