Beurla Reagaird is a nearly extinct, Scottish Gaelic-based cant used by the indigenous travelling community of the Highlands of Scotland, formerly often referred to by the disparaging name "tinkers".
Name
Beurla Reagaird ([ˈpjɤːrˠlˠ̪ə ˈɾɛkərˠtʲ], previously also spelled Beurla Reagair) loosely translates as "speech of metalworkers". Although Beurla today refers to the English language, its original meaning is that of "jargon" (from Old Irish bélre, bél "mouth" plus the abstract forming suffix -re), with the second element being linked to the word eagar "order, array, arrangement" (cf. the Irish Béarla na Saor "speech of the smiths").
References
Beurla Reagaird Wikipedia(Text) CC BY-SA