Possible Clues:

• You've probably heard this locally, in a manner of speaking
• They share a border with the Scots and Irish, for instance? You hear this all the time at Westminster!
• It's all the talk of Liverpool, in a manner of speaking
• Genuine gags, all funny, about hard subject to learn?
• It's the familiar speech, in a manner of speaking
• Billiards player's parlance?
• Oxford subject