Living in N-East England, our word for someone who talked too much was 'gobby'. An alternative was to say that someone 'had a right gob on them'. I've occasionally heard both of these on films and TV progs.
Chi, in the 'clobbering 10-letter game didn't seem to know 'gobbier', the comparative form of 'gobby', probably because he's never been to Northern England.
Anyone else know the word?
MK