A police officer. Old 70s Irish-American slang from New York.

Origin: "Muldoon" is an Irish surname.
Some fuckin' muldoons broke up my party last night.
by sexual mystery December 10, 2014
Get the muldoon mug.
a Muldoon is a male between 25 & 75. They rarely exceed 140 lbs. No job, cut off jeans, trucker hat, stolen sunglasses, cheap tennis shoes or flip flops. Tee shirt usually advertises a national brand beer. His most prized posession is his customized cruiser bike with a seat with springs & high handle bars - 1 speed with coaster brake & a plastic cup holder. Muldoon drinks canned beer in a paper bag.
The Muldoon has an incredible memory for bullshit trivia. Favorite songs include "Hotel California", Maggy May", & "Heart of Gold". Often found in Key West, Hatteras, Margate, NJ,... Ft. Lauderdale is Muldoon Mecca. Muldoons avoid the beach and more often frequent the docks, municipal jail cells, & emergency rooms. The Muldoons girlfriend is a Patti. Pattis have pretty faces with red noses, saggy titties,a hard gut, square asses, and skinny "drinking legs". Pattis are light hearted, Muldoons are often melancholy... under the boardwalk is not just a song, it's a way of life!
Bubsy: Hey, what happened to my beer?
Ed: That Muldoon asked if you were finished & I gave it to him.
by the wetspot March 28, 2008
Get the muldoon mug.
To work an eight hour day regardless of whatever crisis your employees are working on.
I don't care if it gets fixed today, I'm working a muldoon.
by Esphincter December 1, 2006
Get the muldoon mug.
A hairy disgruntled mook from sweden
There was a young fellow named muldoon who ate a great roach then fell off the coach, and never was the same again
by Anonymous October 5, 2003
Get the muldoon mug.
Completely smashed on alcohol and/or other intoxicants
I was completely muldooned last night
by Chris Hume December 24, 2003
Get the muldooned mug.
A stolen credit card. (according to Paulie in the book: Wiseguy (the book that the movie Goodfellas was adapted from))
This food is going to taste wonderful tonight.
Oh yeah?
Yeah, I got a muldoon I'll be paying with.
by Sir. Sacksalot January 12, 2020
Get the Muldoon mug.