The process of locking up a girl for the cold winter months to hook up with while giving the girl a false impression of a potential serious relationship. The guy then lets her go when Memorial Day hits, the weather warms up and the sun dresses start coming out.
Guy 1: So how are things going with that girl you've been seeing?
Guy 2: Everything's cool but I got a house in the Hamptons for the summer so we'll see.
Guy 1: I thought this one actually might turn out to be serious. She's just another winter girlfriend huh?
wintergirlfriend (noun) /wntr)gər(-ə)l-frend/ 1.women who allows you to have sexual relations with her from Halloween to Patties Day. 2.women in an urban area in which the temperature falls below 40 degrees a portion of the year that is used as a non verbal companion during Pro football and College basketball. 3.women to get you through winter until the first day other women start wearing sun dresses again.
Fuck, forecast calls for 30's next week, gotta turn one of these bitches into a wintergirlfriend.....