An adjective used to describe something that is "cool" or, as used to be said "sick". Believed to have been first coined in the North of England.
by nicol3isacat November 9, 2013
Get the Cosymug. by Lord darthwager July 8, 2010
Get the Cosymug. a coffee, bar, and sandwich shop from the east coast that is slowly moving across the country. if you are on the main line you will see that the parking lot of the bryn mawr cosi is constantly filled with luxury cars, tanned girls in north face fleeces and boys in polo shirts. however, their bread is amazing.
main liner 1: "oh my god i am so bored, what should we do?"
main liner 2: "i dunno, let's drive over to cosi and see who's there."
main liner 1: "but i'm not hungry."
main liner 2: "so, we'll just drive around the lot, people are always there."
main liner 2: "i dunno, let's drive over to cosi and see who's there."
main liner 1: "but i'm not hungry."
main liner 2: "so, we'll just drive around the lot, people are always there."
by bread lover May 13, 2005
Get the cosimug. 
When you and a friend are close but are not in a relationship. So you act like a couple but you’re not actually a couple
Guy1: “You and that girl last night, you two looked real close!”
Guy2: “Nah we’re just cosy with each other.”
Guy2: “Nah we’re just cosy with each other.”
by AcRa SwArM November 11, 2017
Get the Cosymug. 
A female, often young, whose interests involve staying in at night in comfy clothes and watching chick flicks (often in oversized comfy clothing usually belonging to the cosy girl's boyfriend).
by Male Students of Cardiff May 23, 2013
Get the Cosy Girlmug.