From The Oxford English Dictionary:
nimble-chops, n.
. . . .
A talkative person. Used chiefly as a form of address.
. . . .
1763 I. Bickerstaff Love in Village ii. ii. 30 Who bid you speak Mrs. Nimble Chops, I suppose the man has a tongue in his head to answer for himself.
Link to the rest at The Oxford English Dictionary
I’m going to have to use that one on myself.
Can’t wait to shush someone with that.