I believe he was making a mischievous translation of a Gaelic text. So I think it's worth mentioning that, although I'm not too familiar with Irish Gaelic, in S

I believe he was making a mischievous translation of a Gaelic text. So I think it's worth mentioning that, although I'm not too familiar with Irish Gaelic, in Scottish Gaelic the word "clach" means "stone" but is also the common word for "testicle". If it's the same in Irish it may be a bit of bilingual punnery.