Definition of "sheugh"

(Ireland, Scotland) A ditch, especially a field boundary ditch usually used to drain fields and mark their boundaries.  examples

(Scotland, colloquial, Northern Ireland, especially coastal) The space between the buttocks.  examples

(Ireland, colloquial) The Atlantic Ocean; the sea. The Irish Sea is the "little sheugh,the Atlantic is the big sheugh. Which also says something about the N. Irish attitude towards the countries on either side of the sheugh.  examples