I herd an oul yin fae mae mither tha nicht
Full as a fitch
The evidence would suggest that this oul sayin comes from the common vetch 'fitch' plant (vicia sativa) which was used as fodder for cattle and horses.
Alternatives
full as a po: full as an egg and full as the eye o a pick
"full as a shugh" is a personal favourite :)
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