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Northern Irish English. Refers to in general terms a traitor to the United Kingdom, or more specifically a British Protestant unionist who is sympathies with Irish Catholic nationalists, used by Loyalists deep-unionists as an insult.

Comes from the 17th century Scottish-born Governor of Londonderry, Robert Lundy and the 1689 Siege of Derry.
That minister in Stormont are not Unionist, he is a bloody Lundy.
Lundy by 8510pm September 8, 2021
1- a work colleague who doesn't tell you the truth
2- a backstabbing friend
3- a liar and cheat
4- a morally inept person
Lundy by linda-1962 November 26, 2010
why are you being such a lundy?
lundy by miamichick July 6, 2010
masc, Brit, EU. A dark horse. Named after a small, remote island off the Devon/Cornish coast of the UK. Infers the named is insignificant and distant but is actually rugged, strong and like a rock but has a propensity to talk absolute BS to the opposite sex, unknowingly fluffing for his best mates. Will always walk home alone gesticulating like an Italian. Latin name: rattus rattus smallus cockus. Eng- brown rat with tiny appendage.
I'll go and Lundy those girls over there. You sit tight and pick em up later.
Lundy by Ding dong old boy February 4, 2010
A homosexual bass fisherman who spends half his day battling trees instead of fish.
Lundy by Chris Lundy January 21, 2024