Name given to members of the US Coastguard. They are known in towns with Coastguard bases for their pirate-like behavior of plundering the town's resource of women and local bars or taverns.

I have been personally told by many of them that they do not like mere civilians calling them that and many of them say that they were the ones who began calling themselves that.
"Kat really likes those Coastie guys. It must be the hot navy blue clothes they wear for work everyday."

OR

"The Coasties really used to come to our town and act like a bunch of pirates by plundering the local bars and taking over the local women. It isn't so much now since the new boat and it not needing as big a crew as the old one"
by iamamissknow-it-all March 29, 2008
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A person, typically from the Gold Coast, Australia, who has a relaxed and carefree demeanor and enjoys engaging in activities that do not involve high standards of etiquette nor require more than limited mental activity. A subcategory of bogan. Coasties will typically have more money than class.

Coasties will usually dress in surf labels and thongs during the day, and wear minimal clothing at night regardless of the temperature, preferably in loud colours or with offensive prints and/or slogans.
"How about we cruise around town in a white hummer tonight drinking vodka and then hit up Shooters? I'll wear my Gasp dress with my gold heels and my sparkly Guess bag" "So coastie, ay!
by coastierocker July 24, 2011
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Specific type of bogan living on the NSW coast, generally between Sydney and Newcastle. Either good-natured-working-class-ocker-type or total speed-dealing-mullet-freak scary prick.
From Hornsby you catch the Coastie Express with the smell of VB and domestic violence in the air.
by sideways April 29, 2004
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A word used by people from Madison, Wisconsin to describe people that dress/speak/act differently that make them feel inferior to people from either coast of the USA. People from the coast dress differently, act differently and speak differently, but are not superior to any other part of the USA, especially Wisconsin. The use of this word inherently illustrates how people from Wisconsin feel about themselves - namely, that they need to feel better by projecting their self hatred on "coasties"
"Michele is such a coastie; she wears tight leggings and Ugg boots."
by ccboy February 29, 2012
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A single gear bike that has a free wheel mechanism as opposed to a fixed gear setup.
Wow homeslice, that coasty is impressing the hell out of me right now.
by moultedsaws September 21, 2008
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The people that give UW-Madison its flavor. Coasties are wrongfully discriminated against by much of the in-state student body. However its only because (for the most part) they party harder, drink more, fuck more, and smoke more weed than most people from Wisconsin. It's okay to be jealous, we know how to have a good time. Don't hate.
"Omg Jenny is such a coastie with her ugg boots and tights!"
"So? She's fucking hot."
by hm2000 October 21, 2009
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Any individual that has their main residence along a coast in very small coastal towns. Coasties are similar to carnies but with an immobile residence.
Dude these coasties are really giving me the creeps. Let's head back inland.
by Bill Umpkin July 28, 2008
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