The name used for a one night stand when the person hangs on in the house the next day. Could also be a sunday girlfriend.
Johm: "Who's that guy in the sitting room?"
Karl: "Oh thats Kate's latest sunday boyfriend, she was out drinking last night."
John: "Oh right, what a slag!"
Karl: "Oh thats Kate's latest sunday boyfriend, she was out drinking last night."
John: "Oh right, what a slag!"
by Derminator February 08, 2009