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Surname of the family originally known as MacAonghusa. It is written that they descendeded from Saran, chief of the Dal Araidhe. They would be a part of the Ui Eathach Cobha in what is now County Down and ultimately ruled as the lords/chiefs (both prominently and intermittently) of Iveagh in Rathfairland until the mid to late 17th century. They also held Castle Dundrum from the late fourteenth century until 1601, and for a brief stint from 1642 to the late 1640's.
Some famous McGuinness people include John Martin McGuinness (Irish Republican politician), Deborah Louise McGuinness (co-director and senior research scientist at the Knowledge Systems Laboratory at Stanford University), Ed McGuinness (comic book artist), and John McGuinness (professional motorcycle racer).
by Ian McGuinness May 01, 2006
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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2
The exceptionally dark, messy, creamy gastric result of eating a Big Mac "meal" and drinking Guinness until you pass out.

Can be used as a noun or verb.
Stop here at this gas station and let me McGuinness their toilet.
by ShoeChew October 11, 2010
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3
A term derived originating from McGeiver, which was then associated to a one McGruber during the superbowl 2009 Pepsi Cola Commercials in which "McGruber" instead of pulling a McGeiver fails to do so and instead drinks a pepsi Cola. The term was then modified to better suit a more talented individual.
1."I need a credit card, a smoke, and a pen...McGuinness are you buying a bottle of Moet? MCGUINNESS!!!"

2."I need a beard, a paperclip, and Jorge...McGuinness are you trying to get kirk out of his exam? MCGUINNESS!!!"
by oxford dictionary sources March 22, 2009
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4
Lumbering, big-nosed dignity-phobe. Tells lies and has scabby hands.
McGuinness looked in the mirror and thought "who is that lumbering, big-nosed dignity-phobe. And what's with those diseased hands?"
by kathy sweeney May 10, 2005
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