Offensive term for Irish person used by racists and bigots. Extensively used by occupying invaders as an insult or put down. Nothing to do with St.Patrick as stated elsewhere. Mick is another word usually used for the same purpose or reason. The usage of either "Mick" or "Paddy" or "Paddy-Wagon' should not be tolerated by good minded people.
Those Paddy (Mick) Bastar*s breed like rabbits and follow Rome (are Catholic).
by dermo2 March 20, 2008
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Slang for an irishman, probably derived from "St. Patrick", a common saint associated with irishmen. Source for "Paddywagon"
Jon's nickname was "Paddy McSpudfucker"
by JiggaJim March 24, 2003
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racial slang for an Irishman

also: a brand of irish wiskey that is found on most irishmen at all times
"aye, tis a blessing to be irish"
by IrishReublicanArmy October 25, 2003
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A Paddy is an Irishman. The traditional Irish name Patrick, used to be spelt Padrick in the slightly older days... Thus making the word Paddy.
Englishman: Hey Paddy! Paddy!
Irishman: Im going ta kill ya to be sure!
by Craig June 15, 2004
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It also is slang positive and negative for an Irishman...and this is the origin. The Irish came to England en masse from two origins. The potato famine in the 1800's when starvation was real, many found passage to the U.S., Canada, on ship work to anywhere in the world there was food. Also cheap workers were needed for cutting by pick and shovel the canal and rail network. They came in their thousands and many settled along the way. Positively many were shortened from Patrick to Pat or Paddy and it became a euphemism for the persons Irish origins.
Then the Irish were well known for enjoying a drink and having a short tempered fuse and kicking off. They caused fights, were well built brawny men through physical labour work...and thirsty when ale quenched thirst, water was polluted. Police came in closed dark wagons...horse and cart at first, nick named paddy wagons as they carried more Irish than English.

Appeasing an Irishman by giving him something positive to try and defuse his temper is where the rhyme song came from
This old man, he played one (as in fought one)
He played Knick knack on my drum (first called bum)
Knick Knack paddy whack, give the man a bone (appease him, give him something to calm him)
This old man came rolling home (as in drunk)
The Paddy flew into a sudden drunken paddy.
by Cassie54 May 18, 2015
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