Definitions by Male Students of Cardiff

Cosy Girl 

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).

Paul: Hey there's Chloe, I wonder if she's any fun.
Owen: Nah, I hear she's a cosy girl

Cosy Girl by Male Students of Cardiff May 23, 2013