Top Definition
Noun. A very chill and mellow person who enjoys the art of smoking blunts, pipes and all sorts of the marijuana plants. You use this word to describe someone who is totally random.
That stoned guy is so random, he must be a Koster.
by Manchizzle February 09, 2008

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Noun. The Friar.
Noun. Slang. a person, esp. one who is annoying or contemptible.
Noun. The Koster, Slang. (used as an intensifier, esp. with WH-questions, to express annoyance, impatience, etc.)

Interjection - Slang. (used to express anger, disgust, peremptory rejection, etc., often fol. by a pronoun, as you or it.)

Verb. Slang. to treat unfairly or harshly.

Verb Phrase: koster up, Slang.
a. to bungle or botch; ruin.
b. to act stupidly or carelessly; cause trouble; mess up.
Verb Phrase. Fuck off, Slang.
a. to shirk one's duty; malinger.
b. go away: used as an exclamation of impatience.
c. to waste time.

Idiom. Give a koster, Slang. to care; be concerned.
Fraud: I got fucked at the used car lot.
Dismay: ahhh koster it.
Trouble: I guess I'm really kostered now.
Aggression: Don't koster with me buddy.
Difficulty: I don't understand this kostered question.
Inquiry: Who the koster was that?
Dissatisfaction: I don't like what the koster is going on here.
Incompetence: He's a koster-off.
Dismissal: Why don't you go outside and play hide and go koster yourself...
by f'ityfff March 11, 2010

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Describes a person that becomes too involved in being lazy, and refuses to partake in outside activities.
"Man Gage was totally pulling a koster today, he stayed inside playing gauntlet instead of coming out and playing frisbee."
by General PainGoD April 14, 2010

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