Green’s Dictionary of Slang

talkative; impertinent.

1823		J.F. Cooper Pioneers (1827) II 52: I don’t think that by nater they are sich tonguey speakers.
1860		T. Haliburton Season Ticket 117: They are a bad lot [...] I never want to see them in here, for they are very tonguey sometimes.
1867		Queenslander (Brisbane) 13 July 3/7: Tonguey! Yes, I am tonguey — that’s part of a woman’s prerogative.
1893		Barrier Miner (Broken Hill, NSW) 17 Mar. 2/3: The assertive ‘tongue-y’ member who will not be easily silenced.
1901		Morn. Pst (Cairns, Qld) 5 Feb. 2/5: The Cooktown Beacon copied the Post’s par about his tonguey black boy.
1912		Camperdown Chron. (Vic.) 15 Oct. 7s/7: A large and tonguey retinue of hired girls.
1937		Sydney Morn. Herald 13 Feb. 13/8: Such songsters as the fantail cockatoo, whose tonguey rattle a bright friend likens to a postman’s whistle.