moich adjective foolish, stupid, silly: She’s a poor moich creature. 20-. etymology: WG found no evidence to support JS’s suggestion that this is ‘possibly Gaelic’; also collected by EMcC/PS; attested by BS in TDITA, JS, SS, BW and DW note:

Canadian Paul Pope (2013) attests the phrase mock as a cucumber which he defines as ‘not the sharpest pencil in the box’.

I think mock in this phrase is perhaps a development of moich ‘stupid’. PC