Gidawn
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Testes, testicles, can be interchanged with words such as jookies. Usually referred to in the plural as gidawns. As Gaeilge, gidán.
De big bayshte got a right sickner in the gidawns an' went down like a sack a' spudz!

Oh, how lovely to see you. Would you like me to translate 'Gidawn' in use for you?
The enormous brute received a frightful blow to the testicles and went down like a sack of potatoes!
Any good?