A hot sexy man/family with a big dick that is bigger then a blue whale.
He must be a costi his dick is so big he could fuck a fat monkey.
by BigDICKY September 1, 2014
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Originated from the brand 'Lacoste',Costie is a word to define the steriotypical chracteristics of teenage boys.

'Look at that fit costie'
'He's such a costie'
Costie boys are typically boys with polo shirts, hoodies, cardians, medium build, slim fitting jeans, plimsoles, converse- (always white). Wears brands like All Saints, Topman, River Island
Likes bands like; Arctic Monkeys, Bloc Party.
by harrrrrrrrvanna November 13, 2009
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A statement made in the mannerism of Costi. Often pertains to an obvious solution to or readily apparent aspect of a given situation.
someone: "I'm tired"
Costi: "Then go to sleep"
someone: "but I've got work to do"
Costi: "then do your work"
by John Dimond February 24, 2005
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A statement made in the mannerism of Costi. Often pertains to an obvious solution to or readily apparent aspect of a given situation.
While playing video games, someone falls off the edge of the map

Cosi: "What you've gotta do is not fall off the edge here."
by John Dimond February 22, 2005
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A Costi is a derogatory slang term for a person, implying that they have an inflated sense of uniqueness, an unwarranted sense of entitlement, or are overly emotional, easily offended, and unable to deal with opposing opinions.
Captain Christopher- Columbus Costi is a Costi
by Costi September 21, 2023
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