from The Century Dictionary and Cyclopedia
- n. (noun) A hen with a crest or topknot.
- n. (noun) A vessel for liquor, containing two Scottish pints, or about three quarts English.
- n. (noun) A large or liberal allowance of liquor, especially wine.
But come, gentlemen, don't let the tappit-hen scraugh to be emptied.
Their bind was just a Scots pint over-head, and a tappit-hen to the bill, and no man ever saw them the waur o't.
It came after the president, Mr George Heaney, presented the Queen with a Tappit Hen, an ornamental drinking vessel with a lid as a gift to mark the chamber's bicentenary.
‘Tappit’ is Scots in origin and means ‘crested.’ The mug is presumably named for its resemblance to the hen.