hyperverbal
overtalkative
yak
gab
logorrhea
yap
motormouthed
talkative
logomania
overtalk
windjamming
multiloquous
jaybird
talkaholism
talksome
mouthy
multiloquy
yappy
polylogy
chunner
chinny
narrative
talkful
verbalization
egotism
smatter
chaffer
jibber-jabber
windbag
talk someone's arm off
Chatty Cathy
like the sound of one's own voice
talk the hind leg off a donkey
talk the leg off the Lamb of God
talk the legs off a pot
blabby
talk someone's head off
bigmouthed
egotistical
blabbermouthed
conversable
run off at the mouth
blabbermouth
leresis
overtalker
babble
talky
verbally
reticent
motormouth