Green’s Dictionary of Slang

mouthamassy (Liza) n.

(W.I.) a chatterbox.

1983		V. Bloom ‘Carry-Go-Bring-Come’ in Touch Mi, Tell Mi 33: Yuh won’ ever haffe fret / For from mi bawn mi no hear nobody / Call me ‘mout-a-massy’ yet.
1994		M. Montague Dread Culture 46: Mout-a-massy Liza never come wid her dry foot pickney dem?
1995		Francis-Jackson Official Dancehall Dict. 34: Mout-a-massey a chatterbox.