“Erse” has two main uses in English, depending on context. In older or more formal usage, it refers to the Gaelic languages of Scotland and Ireland, especially Scottish Gaelic and sometimes Irish Gaelic. In Scots slang, “erse” is also a humorous or slightly crude word for someone’s backside or rear end.

Main meanings

  • A historical or alternative name for the Goidelic (Gaelic) languages, especially:
    • Scottish Gaelic
    • Sometimes Irish Gaelic as well.
  • A Scots dialect/slang word meaning:
    • Bottom, rear end, or “butt.”

Language-related sense

When used in older books or formal contexts, “Erse” usually means:

  • “Gaelic,” particularly the language of the Scottish Highlands.
  • Occasionally Irish Gaelic, e.g., “translated from Gaelic or Erse.”

If you see it in sentences about poetry, Celtic languages, or the Highlands, it is almost certainly this language meaning.

Slang / informal sense

In Scots or Scottish-flavoured English, “erse” is often:

  • A casual, cheeky way to say “backside” or “butt.”
  • Used in body/appearance jokes, e.g., “Does my erse look big in this?” meaning “Does my butt look big in this?”.

Because this sense is informal and a bit crude, it is best avoided in polite or professional contexts.

Information gathered from public forums or data available on the internet and portrayed here.