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.
by 8510pm September 8, 2021
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A random fact brought up in conversation that may or not be correct but is stated as fact. The "fact" is assumed to be true merely because it is stated factually and there is no real evidence to disprove it.
Bill: did you know that 85% of statistics that come up in conversation on the spot?

John: LUNDY!
by distanceroad March 19, 2008
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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
by linda-1962 November 24, 2010
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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.
by Ding dong old boy February 4, 2010
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A cool, kickass brunette. You can trust her, she will never go after your boyfriend or backstab you ;)
Kaja is so Lundis.
by Rose5 April 15, 2011
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Lundi means a beautiful girl that loves everyone. Lundi means a dead fox or Squirrel as well. If you are friends with a lundi you are very lucky to have her in your life. 👏🏼👏🏼
Omg look there is a lundi over there.
by Wjwjsnwinssnwiwnwjsne October 24, 2020
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Lucky underwear, undergarments. Worn on occasions when extra luck is needed.
Person #1: Are you ready for finals today?

Person #2: Awwww yeaaaaa, got my lundies on and everything!
by ThunderDownUnder October 20, 2010
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