Top definition
Any one adult person who engages in acts of a mentally retarded child. Someone who clearly demonstrates a lack of commitment to maturity and the responsibilities that come with it.
Dr. Doback in Step Brothers to his 40 year old son living at home who cant get a job or act like an adult:

"You Jagaloons! You're FAILURES!!"
by mahatma ice August 04, 2009
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2
replacement for stupid, idiot, moron or any other offensive term
maybe you should stop going out with people you find on farmers mingle, you jagaloon
by speck19 July 01, 2015
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3
The guy in a bar who wears a (pink) polo shirt, two sizes too small, with a popped collar; and probably drove there in a Honda Civic.
Bra 1: I Just ordered that Jagaloon an appletini.

Bra 2: Good, that will go nicely with the bag of dicks he’s about to eat.
by PhuzzyLogic July 13, 2009
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4
The guy in a bar who wears a (pink) polo shirt, two sizes too small, with a popped collar; and probably drove there in a Honda Civic.
Bra 1: I Just ordered that Jagaloon an appletini.

Bra 2: Good, that will go nicely with the bag of dicks he’s about to eat.
by PhuzzyLogic July 13, 2009
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5
Noah and Jacob are being real jagaloons!!!
by chicago416 May 04, 2009
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6
One who commits the act of jagaloonery.
Examples of a jagaloon are; John Madden, The Ravens, The entire town of Baltimore
by RPRIII January 19, 2009
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7
One who engages in general Jagaloonery.
The Baltimore Ravens are a bunch of Jagaloons.
by The one who hates the ravens January 19, 2009
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