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
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
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
A small child that acts crazy/retarded.
Noah and Jacob are being real jagaloons!!!
by chicago416 May 04, 2009
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
when one or more people do something comical or act in crazy ways.
stop head-butting people you jagaloon!
by Otzi March 26, 2009
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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