Green’s Dictionary of Slang

1. susceptible to flattery.

1842

Tait’s Mag. IX 725: Her bile [...] was expended to the last drop upon the French; and with the Germans and Italians she is charitable, liberal, indulgent, honeyed; nay, with very particular noble favourites, buttery .

2. flattering, ingratiating.

1855

Broadway Belle (NY) 29 Jan. n.p.: We have sat listening to his [i.e. a ‘stout parson’] buttery oratory [...] the emptiness of his words and the foul hypocrisy of hjs heart .