'As merry as a grig' definitions:

Definition of 'As merry as a grig'

From: GCIDE

Grig \Grig\ (gr[i^]g), n. [Cf. Sw. kr[aum]k little creature, reptile; or D. kriek cricket, E. cricket.]
1. (Zool.) (a) A cricket or grasshopper. [Prov. Eng.] (b) Any small eel. (c) The broad-nosed eel. See Glut. [Prov. Eng.] [1913 Webster]
2. Heath. [Prov. Eng.] --Audrey. [1913 Webster]
As merry as a grig [etymology uncertain], a saying supposed by some to be a corruption of "As merry as a Greek; " by others, to be an allusion to the cricket. [1913 Webster]